SWELLPRO SplashDrone4 User manual

SplashDrone4
User Manual
Check www.swellpro.com for the latest version of this manual and firmware updates
for your drone and accessories.
V2.6 –May 2021

2©2021 Swellpro Technology Co., Limited
Thank You
Thank you for purchasing the Splashdrone 4 (SD4). We have designed and
manufactured the SD4 to the highest quality standards.
Like any marine equipment, long-life and trouble-free operation relies on correct care
and maintenance. With proper care and maintenance, you should enjoy your drone for
many years. After flying in salt or contaminated water, always thoroughly rinse your
SD4 in fresh water immediately after use or before salt and sediment can dry inside
moving parts.
It is important to familiarize yourself with the features of this unique drone by carefully
studying this manual and particularly the priority sections indicated in the Table of
Contents.
Check www.swellpro.com for the latest manuals, software and tips. Refer to the
Version Information section at the end of this manual, which details additions and
corrections to this manual.
Using this Manual
This document is designed to be printed or viewed on a computer or mobile device. If used
electronically, you can search directly for terms like “Propeller” to find references. Additionally,
you can click on any topic in the Table of Contents to navigate directly to that topic.
Video Tutorials
Visit and subscribe to the SwellPro YouTube channel for instructional videos and product
information. Scan this QR code with your camera phone to go to our channel.
Social Media

©2021 Swellpro Technology Co., Limited 3
Join our exclusive user groups on Facebook to meet other people who share their adventures
with SwellPro. www.facebook.com/swellpro/
Register your Product Warranty
Please ensure you register your product as soon as possible to ensure warranty coverage.
www.swellpro.com/
Download the NaviFly App
Get the most from your SD4 by flying with the NaviFly app. This new, powerful mobile app
enhances and optimizes operation of the SD4. Connected wirelessly to the SD4 remote control,
the app allows logging, planning, recording of missions as well as the control and parameter
setting of cameras and other modules in flight.
Running the NaviFly app when you fly adds advanced functionality like mapping, routing and
intelligent modes to the standard flight modes in the remote control.
Scan this QR code to download the latest version.
Table of Contents
Thank You.....................................................................................................................................2
Using this Manual..........................................................................................................................2
Video Tutorials..............................................................................................................................2
Social Media..................................................................................................................................2
Register your Product Warranty.....................................................................................................3
Download the NaviFly App ............................................................................................................3
Table of Contents ...............................................................................................................3
Product Overview................................................................................................................6
Drone Components.............................................................................................................8
Remote control Components .............................................................................................9

4©2021 Swellpro Technology Co., Limited
Remote control Screen..................................................................................................... 10
Drone Indication Lights .................................................................................................... 11
GPS Status................................................................................................................................... 11
Low battery warnings..................................................................................................................11
AUTO Returning Home ................................................................................................................12
Calibration Warning ....................................................................................................................12
Propellers.......................................................................................................................... 12
Attaching and Removing Propellers: ............................................................................................12
Intelligent Battery ............................................................................................................. 13
Checking the charge state of the battery......................................................................................14
Powering On/Off the Battery.......................................................................................................14
Charging the Batteries.................................................................................................................14
Charging the Remote control .......................................................................................................15
Installing the Drone Battery.........................................................................................................15
Flight Modes and Featured Functions ............................................................................. 16
GPS Mode ................................................................................................................................... 16
ATTI Mode ..................................................................................................................................17
Cruise Mode................................................................................................................................ 17
Circle Mode (Orbit)......................................................................................................................17
Headless+ Mode..........................................................................................................................17
Manual+ Mode............................................................................................................................ 18
BOAT (Surface Navigation) Mode.................................................................................................18
Intelligent Follow ........................................................................................................................18
Smooth+ Controls........................................................................................................................ 19
Return Home (RTH) ..................................................................................................................... 19
Remote Control Introduction............................................................................................ 20
Power ON and Power OFF............................................................................................................21
Flight Mode Selection.................................................................................................................. 21
Joystick Controls .........................................................................................................................21
Camera Control ...........................................................................................................................22
Gimbal Control............................................................................................................................22
Intelligent Follow ........................................................................................................................22
Return Home (RTH) ..................................................................................................................... 22
Smooth+ Controls........................................................................................................................ 22
BOAT Mode.................................................................................................................................23
Changing Gimbal Mode ...............................................................................................................23
Payload Release (PL1-S) Switch....................................................................................................23
Low Battery Alarm Warnings .......................................................................................................23
NaviFly APP....................................................................................................................... 24
APP installation...........................................................................................................................24
Connecting the NaviFly APP to the Remote control ...................................................................... 24
Camera Interface......................................................................................................................... 26
Map Interface ............................................................................................................................. 27
Flight.................................................................................................................................. 29

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Compass Calibration....................................................................................................................29
IMU Calibration...........................................................................................................................30
Gyroscope (Accelerometer) Calibration........................................................................................ 30
Aircraft Antenna..........................................................................................................................31
Precautions before flight .............................................................................................................32
Flight Restrictions –No Fly Zones................................................................................................. 32
Night Lights................................................................................................................................. 33
Installing the Camera...................................................................................................................33
Starting and Stopping Motors (Arming the Drone)........................................................................ 34
Basic Flight Steps......................................................................................................................... 35
Water Take-offs and Landings...................................................................................................... 35
Take-offs and Landings from a Boat .............................................................................................35
Water Power-Flip ........................................................................................................................ 36
Appendix ........................................................................................................................... 36
Remote control Rear Port............................................................................................................36
Remote control Pairing................................................................................................................37
Setting the Wi-Fi Password..........................................................................................................37
Joystick Calibration......................................................................................................................38
Specifications ................................................................................................................... 39
Available accessories (purchased separately) ............................................................................... 44
Warranty Information ....................................................................................................... 45
Battery Care and Maintenance......................................................................................... 45
Precautions for low temperature use:.......................................................................................... 46
Battery Charging .........................................................................................................................46
Battery Storage and Transportation.............................................................................................46
Battery Maintenance................................................................................................................... 47
Battery Disposal..........................................................................................................................47
Pre-Flight Inspection and Checks.................................................................................... 47
Flying Guide ................................................................................................................................ 47
Maintenance............................................................................................................................... 48
Flight Safety ...................................................................................................................... 48
Disclaimer and Warning.................................................................................................... 49
Version Information.......................................................................................................... 50

6©2021 Swellpro Technology Co., Limited
Product Overview
The SwellPro Splashdrone 4 (SD4) is the latest evolution of the waterproof drone.
This all-new drone represents over seven years of design improvements and experience - resulting in the
most powerful all-digital floating & flying platform SwellPro has ever built. A new benchmark for
waterproof drones. Simply put, there is no drone in the world like it.
With its modular multi-functional payload system, open interface design and surface navigation mode,
the SwellPro SD4 can quickly adapt to different tasks in the field. The SD4 is the 5th generation of
waterproof drone from SwellPro –the pioneer and innovator of waterproof drones worldwide.
High-visibility, innovative waterproof body design
The design of the SD4's fuselage brings together SwellPro engineers' deep experience and understanding
of waterproof drones, materials and processes. Its structure is simple in design, attractive in appearance,
lightweight, strong and most importantly functional. The body has been designed to facilitate upgrading,
repairing or replacement of parts as well as supporting various custom modifications thanks to
integrated mounting points. A hinged, waterproof hatch makes changing the slide-in battery module fast
and easy.
Powerful propulsion system with tuned flight computer
Following 24 months of intensive R&D, the SwellPro SD4 marries new motors, digital reflux speed
controllers (ESC), an all-new custom flight computer and gyroscope to deliver a fully featured multi-
purpose flight platform. Able to fly in challenging weather conditions with variable loads, your SwellPro
SD4 provides a reliable and flexible solution to the challenges of operating safely over water for long
distances.
Waterproof motors
The newly designed 3510 motors have strong and stable performance with high load-carrying capacity
and excellent flight performance. The motors have been specifically designed for the marine environment
with premium materials, excellent waterproof coatings and salt-water rated bearings to resist damage
from salt and sand in the marine environment.
Microprocessor Controlled Intelligent Drone Battery
Each slide-in SD4 battery has its own integrated microprocessor controller, teamed with 6500mAh of
high-performance lithium technology cells to provide up to 30 minutes of flight time.
Payloads up to 2kg
The SD4 can comfortably lift a payload of 1.5kg with a maximum payload weight of 2kg.
Integrated Anti-collision Strobe
On the top of the SD4, a bright white aircraft anti-collision strobe helps the pilot and other aircraft
pinpoint the drone in low-light and darkness - meeting the regulatory requirements of many regions. The
strobe can be activated or deactivated in flight by NaviFly app.
Fully waterproof IP66-rated multifunction remote control
The SwellPro SD4 digital remote control has been carefully designed to provide worry-free operation in
harsh environments whilst remaining easy to use. Its IP66 rating ensures that it is protected from strong
jets of water as well as sand and debris.
Using new advanced wireless digital radios, the SD4 can broadcast its image over 5km while airborne.
Innovative adjustable antennas can be setup to maximize range depending on the requirements of the
mission being flown. When flying just 0.5m above the water, range is still up to 2.8km and floating on the
water surface the transmission range is 500m.

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The integrated SONY batteries provide a maintenance-free power solution for the remote control and up
to 8 hours of battery life or 12 flights per charge.
A high-brightness 2-inch digital display provides critical aircraft telemetry and flight data giving the pilot
real-time aircraft status even when flying without a tablet or phone attached and the built-in GPS module
allows the SD4 to include the pilot’s precise location in its flight calculations, enabling real-time tracking
and dynamic return-home functions, such as returning to a moving boat.
To ensure waterproofing of the remote control and connected devices, the SD4 remote control provides
for high-speed Wi-Fi connections rather than cables. A pioneering design allows multiple devices to be
connected simultaneously, allowing different apps and devices to be used at the same time during flight.

8©2021 Swellpro Technology Co., Limited
Drone Components
[01] Anti-collision beacon
[02] CW (clockwise) Propeller
[03] Waterproof motor
[04] Rear Arm Light
[05] CCW (Counter-clockwise) Propeller
[06] Landing Gear
[07] Antennas
[08] Battery Status Indicator
[09] Gimbal camera interface
[10] Payload Accessory Interface
[11] SDK Interface
[12] USB Port and Pairing Button
[13] Power Button
[14] Battery Hatch
[15] Battery Hatch Lock
[16] Front Arm Light
[17] Compass Sensor
[18] GPS top cover

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Remote control Components
[01] Automatic Landing Gear Switch
[02] Video Start/Stop Button
[03] Pan/Tilt Wheel
[04] Left Joystick (Throttle/Yaw)
[05] Follow Switch
[06] Smooth+ Yaw Selector Switch
[07] Smooth+ Yaw Control
[08] Ship/Surface Navigation Selector Switch
[09] Left Payload Release Switch
[10] Display Screen
[11] Charging Indicator
[12] Right Payload Release Switch
[13] Gimbal Control Mode Switch
[14] Smooth+ Roll Selector Switch
[15] Smooth+ Roll Control
[16] RTH Return Home Button
[17] Power Button
[18] Right Joystick (Pitch/Roll)
[19] Flight Mode Selector Switch
[20] Camera Shutter Release Switch
[21] Gimbal Pitch Roller
[22] Antennas
[23] Phone/Tablet Clamp Adjustment Nut
[23] Phone/Tablet Mount

10 ©2021 Swellpro Technology Co., Limited
Remote control Screen
[01] Remote control Battery Level
[02] Remote control GPS Location Locked
1
[03] Drone Signal Strength
[04] Flight Mode
[05] Drone Battery Voltage
[06] Drone GPS Location Accuracy 3
[07] Drone Height from Take-off Point
[08] Drone Distance from Take-off Point
[09] Drone Battery Remaining Charge
[10] Horizontal Air Speed
[11] Vertical Air Speed
[12] Estimated Remaining Flight Time
[13] Forward Pitch Angle
[14] Flight Time
[15] Current Drone Latitude Position 4
[16] Current Drone Longitude Position 4
[17] Sideways Roll Angle
[18] Drone Yaw (Compass) Angle
[19] Remote Control Serial Number Firmware Version
Number
[20] Flight Controller Serial Number
[21] Flight Controller Firmware Version
[22] Total Flight Time
[23] Joystick and Control Input Data
Notes.
1. A flashing GPS Location Fix icon [02] indicates that the remote control does not have a current location
fix. This does not relate to the drone’s GPS accuracy.
2. Flight Modes: G: GPS mode, A: ATTI mode, C: Circle mode, H: Headless+ mode, F: Fixed Speed mode,
M: Manual+ mode, B: Boat/ Surface Navigation mode
3. Drone GPS Location Accuracy ranges from 1-10 with 10 being the highest accuracy.
A rating of 10 indicates a drone location accuracy <1m. 9=1.1 meters; 8=1.2 meters, 7=1.3 meters,
6=1.4 meters, 5=1.5 meters. In GPS mode, it is recommended to take off with at least 5.
4. If the signal to the drone is lost for any reason, the remote control will display the last known location
of the drone.

©2021 Swellpro Technology Co., Limited 11
Drone Indication Lights
The fuselage of the aircraft includes drone status indicator light (red) and GPS signal status
indicator light (green). Their location is shown in the figure below.
The nose LED indicator is used to indicate the direction of the aircraft's nose. These lights will glow
alternatively red and green during startup.
The aircraft status indicator lights on the rear arms indicate the current status of the flight control
system. All navigation lights can be turned on or off through APP settings
GPS Status
Steady Green - Good GPS signal
Fast Flashing Green - Poor GPS signal
Low battery warnings
Two Red Flashes - First level low battery warning. Land as soon as
possible.
Fast Red Flashing - Second level low battery warning. Drone will auto land.
Rear Green LED
Forward Red LED

12 ©2021 Swellpro Technology Co., Limited
AUTO Returning Home
AUTO returning home
Calibration Warning
Red/Green slow flashing. Sensor calibration required. Refer to the remote
control screen for details.
Propellers
The SD4 has two pairs of propellers - two clockwise propellers and two counter-clockwise
propellers. The hub of each motor shows the type of propeller used for that motor. Propellers
cannot be accidentally attached to the wrong motor.
Attaching and Removing Propellers:
Note : Always place one hand under the motor to support it when
installing or removing propellers.
Failure to provide this support could result in bending or breaking
the landing gear.
1. Check that the propeller rotation (CW or CCW) matches the
motor hub. This is the normal direction the propellers spin during
flight.
2. Rotate the propeller in the hub until it engages, then push the
propeller downwards and rotate it 1/8th of a turn in its opposite direction to lock it. So a CW (clockwise)
propeller is locked by turning it counterclockwise.
3. Check the propeller is completely locked by checking that the dots on the propeller and hub align or by
holding to motor hub firmly and ensuring that the propeller cannot be turned.

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4. To remove propellers, support the motor with one hand and press the propeller down and then rotate it
1/8th of a turn in its normal direction to unlock it from the hub. So, CW (clockwise propellers) are
unlocked by turning clockwise
The blades are sharp, please be careful to avoid personal injury.
Prior to each flight, please check that the propellers are smooth all over and are correctly installed and
securely fastened.
Spin each propeller by hand to check that the motors are free of sand or salt and spin freely
Intelligent Battery
Each slide-in SD4 battery has its own integrated microprocessor controller, teamed with 6500mAh of
high-performance lithium technology cells to provide up to 30 minutes of flight time.
The SD4 intelligent battery provides:
1. Real-time power monitoring and alerting
2. Integrated balance charging to ensure battery health, safety and long life by constantly monitoring
battery health, state-of-charge and temperature.
3. Fast, slide in battery replacement. Integrated connectors allow for wire-free installation and
replacement.
4. Battery charging and usage data logging to allow for better battery management and event recording.

14 ©2021 Swellpro Technology Co., Limited
Checking the charge state of the battery
The battery level LEDs on the battery pack allow you to check the state of charge of the battery quickly
and accurately.
With the Battery turned OFF, briefly press the power button –the battery LEDs will indicate the state of
charge.
Powering On/Off the Battery
Briefly press the power button, then press and hold the power button for three seconds to turn the battery
on or off.
Charging the Batteries
Your SD4 is shipped with partially charged batteries. Ensure the drone battery and the remote control
battery are fully charged before use.
The drone and remote control batteries can be charged simultaneously using the supplied AC charger.

©2021 Swellpro Technology Co., Limited 15
How to charge:
Refer to the above figures to connect the intelligent battery and charger. Press the power button to turn
on the intelligent battery, and the battery will automatically enter the charging state. When the battery is
fully charged, the intelligent battery will shut down automatically.
Never charge the intelligent battery immediately after flight or when hot. Wait for the battery to cool and
then start charging. The ideal battery charging temperature is between 23°- 28°C (73-82°F)
Charging the Remote control
The remote control can be charged from the supplied charger or from a standard USB socket.
The charging indicator on the charger will change from RED to GREEN when the remote control is fully
charged.
The USB socket on the supplied AC charger can also be used to power or charge other USB devices such
as mobile phones and tablets.
Installing the Drone Battery

16 ©2021 Swellpro Technology Co., Limited
The Intelligent battery is quick and easy to change. Ensure the battery is OFF before inserting or removing
it from the drone.
Unlock the waterproof hatch door and open the catch.
Open the battery hatch door.
Slide in the fully charged intelligent battery and fold the battery handle
flat.
Close the battery hatch. Fasten the catch and then lock the hatch.
Always check to ensure that the waterproof seal on the hatch door is
clean and lightly lubricated.
The drone is no longer waterproof when the battery hatch is open. Do not allow water or sand to enter the
drone while the battery hatch is open.
The Appendix of this manual contains additional warnings and precautions regarding the batteries,
safety, charging and maintenance. Please ensure you familiarize yourself with all of this information to
get the most from your purchase.
Flight Modes and Featured Functions
The SwellPro SD4 utilizes an all-new, high-performance flight computer. Flying with just the remote
control (without using the NaviFly app) the drone natively supports six different flight modes. The NaviFly
app adds further functionality and allows the pilot to choose the custom mode accessible from the
remote control’s Flight Modes switch.
The Native Flight Modes are: GPS mode; ATTI mode; Curise Mode; Circle Mode;
Headless+ Mode; Manual+ Mode
The Featured Functions are: Boat Mode; Intelligent Follow; Smooth+ Controls; Return
Home (RTH)
GPS Mode

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In this native mode the multi-mode GPS module, barometer, gyroscope and accelerometers work
together to realize intelligent flight functions such as accurate height setting, fixed-point hovering,
intelligent flight and intelligent return. In this mode the maximum flight speed is 10m/s, the maximum
ascent speed is 4m/s, and the maximum descent speed is 4m/s.
ATTI Mode
In this mode, the flight computer maintains aircraft altitude and attitude but does not stabilize position.
This mode is particularly useful when landing the drone on a moving boat. The maximum flight speed in
this mode is 18m/s. With good GPS coverage, automated return home functionality is maintained. As
braking is not automatic in ATTI mode, ensure you leave at least 30 meters of braking distance from
obstacles.
Cruise Mode
In this mode, the aircraft will enter and fly forward at a minimum speed of 1 m / s. The pitching rod is
pushed forward and the aircraft accelerates; The pitching rod is pulled back and the aircraft decelerates.
When the expected flight speed is reached, release the joystick, and the aircraft will keep the current
speed. The forward direction of the aircraft is controlled by the yaw rod, and the flight height can be
controlled by the throttle rod at any time.
Circle Mode (Orbit)
This mode is mainly used to surround the target object, and the maximum surrounding radius is 150
meters. When the aircraft moves above the target and turns on the orbit, it will take the target as the
center, retreat 10 meters and adjust the nose direction. At this time, the pitching rod is pulled down to
expand the surrounding radius, and the pitching rod is pushed up to reduce the surrounding radius (at
least 10 meters); The roll rod controls the speed and direction of the circle (better with smooth + knob).
Example: when the aircraft is circling clockwise, push the roll rod to the right to increase the speed of the
circle, and push the roll rod to the left to reduce the speed of the circle until it is circling
counterclockwise. The throttle rod can adjust the flight altitude, and the yaw rod does not work. When
performing the surround mode, the aircraft and gimbal camera will automatically adjust and aim at the
surround target. During the surround process, you can adjust the gimbal camera angle.
Headless+ Mode
This mode is mainly used to simply let the aircraft return when it flies beyond the line of sight and can't
distinguish the aircraft position and nose direction; Working mode: the yaw lever does not work, the
throttle lever works normally, the pitching lever is pushed forward, the aircraft flies straight ahead, the
pitching lever is pulled backward, the aircraft flies straight to the direction of the remote control, or even
over the position of the remote control; In this mode, by simply controlling the roll bar, the aircraft will fly
around with the remote control as the center. This mode, combined with the smooth + knob, can easily
achieve variable speed / uniform circle flight shooting at any radius and angle.

18 ©2021 Swellpro Technology Co., Limited
Manual+ Mode
In this mode, the aircraft does not have the function of fixed point and fixed height, and only
maintains the attitude stabilization. When flying in attitude mode, the aircraft will maintain its
attitude automatically. The adjustment of aircraft height, speed and position needs to be
controlled manually and timely. Compared with atti mode, manual + mode lacks height setting
function. It is used in some ultra low altitude flight, and this mode has no limit on the speed of
ascend and descend, and may be used in some scenarios（This mode is semi professional,
and the pilot should choose this mode carefully.
BOAT (Surface Navigation) Mode
In Boat mode, the SD4 can effectively be controlled like a boat on the surface of the water. With a
maximum surface speed of 1m/s. Control instruction: In GPS mode, after the aircraft lands to the water,
wait for the aircraft to enter idle (locked standby) state, and press the boat mode key to enter. After
entering the Boat mode, the Throttle rod does not work, the Yaw bar controls left / right turn, the Pitch rod
pushes forward to accelerate, and the Roll rod does not work. Press the Boat mode button again to exit,
and the aircraft can take off normally.
In Boat mode, NaviFly app intelligent navigation mode can be used normally, such as fixed point hover,
pointing navigation, route planning, grid search, intelligent surround, etc.
Boat mode application: combined with each camera and extension bar, underwater photography and
underwater search; combined with the Gimbal Up-hang kit and the GC3-S gimbal camera for surface to
air photography; Large scale fish swarm search with fish finder (Dronar 01)
Note: When operating in Boat mode, take care that the landing gear and other attached accessories do
not get caught on weed or other debris that could prevent the drone from flying.
Intelligent Follow
The SwellPro SD4 uses an innovative relative position follow. With good GPS signal for the drone and the
remote control, when Follow Me is activated, the drone will maintain its position relative to the remote
control and can lead, follow or parallel chase the position of the remote control, adjusting the position of
the camera gimbal and drone to keep the camera pointed at the remote control (pilot).
While the drone is in Follow Me mode, you can adjust the aircraft direction, following distance, camera
angle.
Start Follow Me: Check that the remote control has GPS lock by checking the GPS status indicator on the
screen. Press and hold the Follow Me button. The remote control will beep and
vibrate twice.
Stop Follow Me: Short press the "FOLLOW ME" button, the remote control will
beep and vibrate twice and the drone will initiate the return home process.
The remote control will beep and vibrate once to indicate that Follow Me has
been cancelled.

©2021 Swellpro Technology Co., Limited 19
Smooth+ Controls
The patented "Smooth+" flight dials allow the pilot to switch from joystick
control of roll and yaw to a dial to finely adjust and maintain a desired
drone attitude. Whether filming or surveying, with Smooth+ you can “dial-
in” just the right amount of aircraft movement to achieve and maintain
smooth pans, orbits and sweeps - hands-free!
Once Smooth+ is started, the selected function is switched from the
joystick to the control knob. To return the function to the joystick, disable
Smooth+.
Smooth+ YAW: Check that the Smooth+ YAW control knob is in the center. Press the left-hand Smooth+
button. The remote control will beep and aircraft rotation (YAW) control will move to the left-hand Smooth+
knob. YAW will now be disabled on the joystick. Press the Smooth+ button again to return YAW control to
the joystick. This function is very useful for accurate manual orbit flights.
Smooth+ ROLL: Check that the Smooth+ ROLL control knob is in the center. Press the right-hand Smooth+
button. The remote control will beep and aircraft sideways control (ROLL) will move to the right-hand
Smooth+ knob. ROLL will now be disabled on the joystick. Press the Smooth+ button again to return ROLL
control to the joystick. This function is useful when manually tracking an object or for dolly pan maneuvers.
Return Home (RTH)
Long press the Return Home button, the remote control will give out two vibrations and beeps to indicate
that the drone will commence the return home process.
The SD4 constantly records the GPS position of the pilot, allowing the aircraft to always return to the pilot
even if they have moved from the original take-off point. This dynamic home-point location is used if the
aircraft needs to return home due to a loss of control signal error or if the pilot initiates a return to home
command.
If no pilot GPS position is established by the remote control, the drone will return to the take-off point.
Once a pilot GPS location is received from the remote control, the drone constantly updates its home
position. Should the signal to the remote control fail, the drone will return to the last known location of
the pilot.
By default, the SD4 constantly records the GPS position of the pilot, allowing the aircraft to always return
to the pilot even if they have moved from the original take-off point. This dynamic home-point location is
used if the aircraft needs to return home due to a loss of control signal error or if the pilot initiates a
return to home command.
If no pilot GPS position is established, the drone will return to the take-off point. Once a pilot GPS location
is received from the remote control, the drone constantly updates its home position. Should the signal to
the remote control fail, the drone will return to the last known location of the pilot.
After the return function is activated either manually or automatically, the aircraft will fly to the current
home point and land. If the home position is obtained from the remote control, the aircraft will land 3
meters in front of the recorded position.
Return Home Process

20 ©2021 Swellpro Technology Co., Limited
If the drone’s height > 20m* and the distance from Home Point > 15m, the
drone will maintain its altitude and return to its Home Point before landing.
If the drone’s height < 20m* and distance from Home Point > 15m, the
drone will climb to 20m* and then return to its Home Point before landing.
Note : If the GPS signal is poor or GPS doesn’t work, the Return Home
function will not be available.
* The RTH Return Home height can be set in the NaviFly app.
During the return home process, the left and right joysticks of the remote control can be operated to
facilitate the avoidance of obstacles or change the landing point. When you stop operating the joystick, the
aircraft will continue to return home. During the return home process, the Flight Mode switch is disabled,
but the control of accessories such as payload release modules works normally.
Remote Control Introduction
SD4 remote control has been carefully designed to provide worry-free operation in harsh environments
whilst remaining easy to use. Its IP66 rating ensures that it is protected from strong jets of water as well
as sand and debris so it can be confidently used in any weather conditions.
The remote control battery provides up to 8 hours of battery life or 12 flights per charge.
The integrated high-brightness 2-inch digital display provides critical aircraft telemetry and flight data
giving the pilot real-time aircraft status even when flying without a tablet or phone attached.
To ensure waterproofing of the remote control and connected devices, the SD4 remote control provides
for high-speed Wi-Fi connections rather than cables. A pioneering design allows multiple devices to be
connected simultaneously, allowing different apps and devices to be used at the same time during flight.
The remote control’s built-in GPS module allows the SD4 to include the pilot’s precise location in its flight
calculations, enabling real-time tracking and dynamic return-home functions, such as returning to a
moving boat.
The "Smooth+" flight dials allow the pilot to switch from joystick control of roll and yaw to a dial to finely
adjust and maintain a desired drone attitude. Whether filming or surveying, with Smooth+ the pilot can
“dial-in” just the right amount of aircraft movement to achieve and maintain smooth pans, orbits and
sweeps - hands-free!
Note: Install the Remote control antennas BEFORE turning the power on. Failure to install the antennas before
powering on the remote control may cause permanent damage to the remote control.