Mercury 8M6009517 User manual

90-8M0172030 eng JULY 2020 © 2020 Mercury Marine Page 1 / 6
SMARTCRAFT/NMEA 2000 GPS
IMPORTANT: This document guides our dealers, boatbuilders, and company service personnel in the proper installation or
service of our products. If you have not been trained in the recommended servicing or installation procedures for these or
similar Mercury Marine products, have the work performed by an authorized Mercury Marine dealer technician. Improper
installation or servicing of the Mercury product could result in damage to the product or personal injury to those installing or
operating the product. Always refer to the appropriate Mercury Marine manual for component removal and installation
instructions.
NOTE: After completing installation, place these instructions with the product for the owner's future use.
Components Contained in Kit
71440
12
3
4
Ref. No. Qty. Description
1 1 GPS sensor
2 1 Under helm bracket
3 2 Screws, wood #8 (5.4 mm (0.21 in.) x 13 mm (0.51 in.))
4 4 Deck mounted bracket
! WARNING
Use of this GPS as a navigational source for any automatic pilot system where that system has control of the vessel
heading, steering systems, trolling motors, or engines could result in serious injury or death from the loss of vessel control.
These referenced automatic piloting systems include but are not limited to Mercury Marine joystick and electric steering
systems in all configurations.
Certification
NMEA 2000 load equivalency number (LEN) 2
NMEA certification Yes
Product name Mercury SmartCraft/N2K GPS
Description Mercury GNSS receiver for SmartCraft or N2K applications
Manufacturer code 144‑Mercury Marine
Product code 27251
Class code 60‑Navigation
Function code 145‑Ownship position (GNSS)
Mounting Requirements
IMPORTANT: The GPS sensor connection is considered a drop off of the CAN bus or NMEA network. Ensure that the
installation of the GPS sensor does not exceed CAN bus length specifications.
IMPORTANT: The installation location must take into account the following requirements:

SMARTCRAFT/NMEA 2000 GPS
Page 2 / 6 © 2020 Mercury Marine 90-8M0172030 eng JULY 2020
•Elevation (above vs below deck)—Although the GPS sensor antenna can be mounted above or below the deck,
mounting above the deck will yield optimal performance.
1
2
3
60768
Location Location description
1Mounted above decks with clear unobstructed view of the sky in all directions. This location provides optimal
GPS sensor performance.
2Mounted below decks with only fiberglass between the sky and GPS sensor. A reduction in sensor
performance will occur when mounted below decks.
3 This location is not recommended for the GPS sensor installation.
•All Location Requirements—Mount the GPS sensor in an area close to the vessel's center of gravity to reduce pitch
and roll effects on position reporting. Install the GPS sensor a safe distance away from all hazards that could result in
physical damages, excessive vibration, or excessive heat.
•Electromagnetic Interference (EMI)— Poor performance and loss of satellite signals will result from mounting the GPS
sensor too close to strong sources of EMI. Observe the following installation requirements regarding EMI:
• Mount the GPS sensor a minimum of 0.91 m (3 ft) from any engine(s).
• Mount the GPS sensor a minimum of 0.91 m (3 ft) from any radio or radar antennas.
• Do not mount the GPS sensor in the direct path of any radar antennas.
•Vessel construction—Do not mount the GPS sensor in locations where immediate surroundings of the boat structure
contain large metallic or reflective material surfaces.
•Prevailing conditions—Calm and clear weather conditions provide optimal conditions for GPS sensor accuracy.
Locations at extreme North or South latitudes may reduce the GPS satellite signal strength. GPS sensors that are
mounted below decks will be more susceptible to performance issues when operating in sub‑optimal conditions or
locations.
GPS Sensor and Connector Clearance Dimensions
a - 60.7 mm (2.39 in.)
b - 18.5 mm (0.73 in.)
c - 76.2 mm (3 in.) connector clearance
a
b
71428
c

SMARTCRAFT/NMEA 2000 GPS
90-8M0172030 eng JULY 2020 © 2020 Mercury Marine Page 3 / 6
Under Helm Bracket and Connector Clearance Dimensions
a - 102.5 mm (4.03 in.)
b - 32 mm (1.26 in.)
c - 76.2 mm (3 in.) connector clearance
Sensor Installation
GPS Sensor Mounting
IMPORTANT: Perform the installation only with the vessel at a complete standstill either on land or secured to a dock.
Deck Mounted Bracket
1. Using the dimensions from GPS Sensor and Connector Clearance Dimensions, choose a suitable location to mount
the GPS sensor deck mounted bracket.
2. Using the deck mounted bracket as a template, mark the location for the NMEA 2000 harness pass‑through hole on the
deck and mark the location for the three screws on the deck.
IMPORTANT: Do not drill through the deck mounted bracket.
3. Use a 22 mm hole saw or suitable cutting tool to remove the deck material for the NMEA 2000 harness pass‑through
hole.
4. Drill three pilot holes using a 3.18 mm (1/8 in.) drill bit for the #8 screws.
5. Apply a bead of weather‑proof marine grade sealant to fill the sealant groove on the bottom of the deck mounted bracket.
6. Affix the deck mounted bracket to the deck surface while aligning the pass‑through hole in the deck to the hole in the
bracket. Simultaneously, align the screw holes in the bracket with the pre drilled pilot holes.
IMPORTANT: Do not overtighten the three screws.
NOTE: Different deck materials may require the screws to be tightened to specific torque values.
7. Install the deck mounted bracket on the deck with the three screws.
8. Remove any excess sealant that has pushed through to outside of the deck mounted bracket or inside of the hole in the
deck.
9. Route the NMEA 2000 harness through the hole in the deck and deck mounted bracket.
10. Thread and tighten by hand the NMEA 2000 harness end onto the GPS NMEA receptacle, being careful not to
cross‑thread the fittings.
11. Locate and remove the paper covering on the adhesive ring located on the bottom of the GPS sensor.
a
b
71443
c

SMARTCRAFT/NMEA 2000 GPS
Page 4 / 6 © 2020 Mercury Marine 90-8M0172030 eng JULY 2020
12. Install the GPS sensor into the deck mounted bracket. Press firmly in multiple locations around the GPS sensor to ensure
360‑degree contact between the adhesive ring and deck mounted bracket.
a - GPS sensor
b - Bottom of GPS sensor
c - Screw (3)
d - Hole in deck mounted bracket (3)
e - Groove
f - Cable
g - Deck mounted bracket
h - Hole in the deck
i - GPS NMEA cable end
j - Deck
Under Helm or Bulkhead Mounting
1. Using the dimensions from Under Helm Bracket and Connector Clearance Dimensions, choose a suitable location to
mount the GPS sensor under helm bracket.
2. Route the NMEA 2000 harness through the under helm bracket.
3. Thread and tighten by hand the NMEA 2000 harness end onto the GPS NMEA receptacle, being careful not to
cross‑thread the fittings.
4. Remove the paper covering on the adhesive ring located on the bottom of the GPS sensor.
5. Install the GPS sensor into the under helm bracket. Press firmly in multiple locations around the GPS sensor to ensure
360‑degree contact between the adhesive ring and the under helm bracket.
6. Place the under helm bracket assembly flush against the underside of the helm or the bulkhead surface.
7. Mark and use a 3.18 mm (1/8 in.) drill bit to pre‑drill the screw holes into the underside of the helm or the bulkhead
surface.
IMPORTANT: Do not overtighten the two screws.
NOTE: Different deck materials may require the screws to be tightened to specific torque values.
8. Install the under helm bracket assembly under the helm or the bulkhead surface with the two screws.
9. Make a strain relief in the cable as shown below and attach the strain relief to the under helm bracket spur with a cable
tie.
a - Underside of helm
surface
b - Bulkhead
c - GPS sensor
d - Bottom of GPS sensor
e - Under helm bracket
screw hole (2)
f - Screw (2)
g - Under helm bracket
h - Spur
i - Strain relief
j - Under helm mounting
k - Bulkhead mounting
l - NMEA 2000 harness
m - NMEA 2000 harness
end
71432
a
b
c
c
i
c
j
h
d
d
d
f
g
e
71439
c
d
e
f
g
l
mh
f
e
a
i
bc
e
f
g
l
m
f
e
d
h
i
j
k

SMARTCRAFT/NMEA 2000 GPS
90-8M0172030 eng JULY 2020 © 2020 Mercury Marine Page 5 / 6
GPS Sensor Connections
The GPS sensor is fully compatible with Mercury SmartCraft and NMEA 2000 communication networks. Refer to the following
diagrams to properly connect the GPS sensor to the network on your vessel.
GPS Sensor Connection—CAN P
a - GPS sensor
b - NMEA 2000 harness (optional)
c - CAN P GPS sensor harness (sold
separately)
d - Junction box (J‑box) 4‑way shown
e - SmartCraft gauge or device
f - Helm harness
GPS Sensor Connection—NMEA 2000
a - GPS sensor
b - NMEA 2000 harness
c - Chartplotter
d - 120‑ohm termination resistor,
1 male and 1 female
e - NMEA 2000 fused power
source
f - Accessory power relay
terminal bus
g - SmartCraft multifunction
device
Verification
For GPS Speedometer for a Display:
Using a NMEA 2000 MFD, locate the network device list and verify the GPS sensor is on the list of devices. Refer to the
MFD's operations manual to locate network data screen.
For a Mercury Marine MFD or SmartCraft Gauge:
1. Using a Mercury Marine MFD, locate the network device list and verify the GPS sensor is on the list of devices. Refer to
the MFD's operations manual to locate network data screen.
2. For the System Tachometer, System Speedometer, MercMonitor, or other SmartCraft capable gauges refer to the
applicable operations manual to correctly source the GPS sensor. Test operations.
71430
acd
e
f
b
a
b
c
d
d
f
g
e
71431

SMARTCRAFT/NMEA 2000 GPS
Products of Mercury Marine © MERCURY MARINE. All rights reserved. Reproduction in whole or in part without permission is prohibited. Alpha,
Axius, Bravo One, Bravo Two, Bravo Three, Bravo Four S™, Circle M with Waves Logo, GO BOLDLY, K-planes,
Mariner, MerCathode, MerCruiser, Mercury, Mercury with Waves Logo, Mercury Marine, Mercury Precision Parts,
Mercury Propellers, Mercury Racing, MotorGuide, OptiMax, Pro XS, Quicksilver, SeaCore, Skyhook, SmartCraft,
Sport-Jet, Verado, VesselView, Zero Effort, Zeus, #1 On the Water and We're Driven to Win are registered
trademarks of Brunswick Corporation. Mercury Product Protection is a registered service mark of Brunswick
Corporation. All other marks are the property of their respective owners.
W6250 Pioneer Road
Fond du Lac, WI 54936-1939
Page 6 / 6 © 2020 Mercury Marine 90-8M0172030 eng JULY 2020
For Mercury Marine Active Trim feature:
Test and verify the functionality of the Active Trim. The GPS sensor should automatically connect to Active Trim controller.
NMEA 2000 PGN Information
Data PGNs Data
59904 ISO Request
60160 ISO transport protocol
60416 ISO transport protocol
60928 ISO address claim
126464 PGN List
126992 System time
126993 Heartbeat
126996 Product information
126998 Configuration information
129025 Position, rapid update
129026 COG and SOG, rapid update
129029 GNSS position data
129539 GNSS DOPs
129540 GNSS sats in view