Raymarine L365 User manual

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Any reference to Raytheon or
RTN in this manual should be
interpreted as Raymarine.
The names Raytheon and RTN
are owned by the
Raytheon Company.

FishFinder L365
Instruction Manual
Raymarine

iv
Contents
Echo sounding – How it works (inside front cover)
FishFinder L365 – Features and functions i
For information and service ii
1Introduction 1
About the FishFinder L365 1
System Components 2
Standard Equipment 2
Standard Transducers 2
Optional Accessories 2
2Installation 4
About the Transducer 4
Selecting the Correct Type of Transducer 5
Assembling the Transducer Bracket 6
Positioning the Transom-Mount Transducer 6
Mounting the Transom-Mount Transducer 9
Mounting the Optional Sidelooker Transducer 10
Installation Notes – Thru-Hull Transducer 11
Installation Notes – In-Hull Transducer 12
Installation Notes – Trolling Motor Transducer 13
Installation Notes –
Transducer for Speed and Temperature Only 14
Mounting the Display Unit – Standard Mount 14
Dismounting the Display Unit 16
Mounting the Display Unit – Flush Mount 16
Installing the Transducer Cable 17
Installing the Transducer Cable – Sidelooker Option 19
Installing the Transducer Cable –
Separate Speed and Temperature Sensors 20
Making the DC Power Connections 20
Calibrating the Sensors 22
3Operating Instructions 24
Controls on Display Unit 24
Turning the Power On and Off 25
Setup Memory 25
Lamp/Contrast Menu 26
Operating Pages 28

v
FishFinder Page 29
Choosing a Frequency 34
Fish Indications 35
Bottom Indications 36
Performance Modes 37
Zoom Page 38
A-Scope (Bottom Coverage) Page 40
Digital Page 42
Sidelooker Page 43
4Setup Instructions 47
The Setup Menu 47
Range Setting 48
Sensitivity Setting 49
Chart Speed Setting 50
Zoom Setting 52
Frequency Setting 53
Resetting the Log 54
System Setup Display 55 Fish Alarm 58
Simulator 56 Buzzer 58
Fish Symbol 56 Depth Units 59
White Line 56 Speed Units 59
Sidelooker 56 Temp Units 59
Speed Cal 57 Speed 59
Temp Cal 57 Log 59
Shallow Alarm 57 Temp 59
Deep Alarm 58
Setup Instructions for Sidelooker 60
Resetting the Unit to Factory Defaults 62
Default Settings 63
5Maintenance andTroubleshooting 64
Cleaning Instructions 64
Troubleshooting Suggestions 64
Servicing a Thru-Hull Transducer 68
How to Contact Raymarine 68
6Specifications 72
General Information 72
FishFinder Functions 73
Connector Diagrams 74
Glossary of Terms 75

vi
List of Figures
Figure Page
Unit in Use Inside front cover
Front Panel i
1-1 Typical Installation 1
2-1 Transducer Types 5
2-2 Assembling the Transducer Bracket 6
2-3 Transducer Mounted on Transom 7
2-4 Transducer Bracket, Side View 7
2-5 Correct Mounting Position 8
2-6 Mounting the Transducer 8
2-7 Installing the Sidelooker Transducer 10
2-8 Installing the Sidelooker Transducer -
Trolling Motor 13
2-9 Installation on Bracket 14
2-10 Dimensions 15
2-11 Flush-Mount Installation 16
2-12 Disassembling from Bracket 17
2-13 Installing Cable on Transom 18
2-14 Cable for Sidelooker Transducer 19
2-15 Cable for Speed and Temperature Sensor 20
2-16 DC Power Connections 21
3-1 Display Panel 24
3-2 Lamp/Contrast Menu 26
3-3 Selecting DisplayPages 27
3-4 FishFinder Page 29
3-5 Fish Indications 36
3-6 Bottom Conditions 37
3-7 ZoomPage 38
3-8 A-Scope Page 40
3-9 Digital Page 42
3-10 Sidelooker Feature 43
3-11 Sidelooker Page 44
4-1 Moving Through the Setup Menu 47
4-2 Range Settings 48
4-3 Sensitivity Setting 49
4-4 Changing the Chart Speed Setting 50
4-5 Chart Speed Setting 51
4-6 Zoom Settings 52
4-7 Frequency Setting 53
4-8 Resetting the Log 54
4-9 Reaching the System Setup Display 55
4-10 System Setup Display 55
4-11 Sidelooker Range Settings 61
4-12 Sidelooker Sensitivity Settings 62
5-1 Sample Mailing Label 70
6-1 Connector Diagrams 74

1
1 – Introduction
About the FishFinder L365
The FishFinder L365 is a system that uses sound waves (“sonar”) to
detect fish and show the bottom of a lake or sea. The system includes a
transducer and a display unit, connected by a cable. The transducer
sends high-frequency sound waves down into the water. These sounds
strike fish, the bottom, or other objects in the water, and return as echoes.
The FishFinder then interprets these echoes and presents a display.
The FishFinder L365 can handle many different jobs:
• detect the presence of fish below the boat
• trigger an alarm when fish are found
• measure the depth of the water
• set alarms for minimum and maximum depth
• show the shape of the bottom
• determine whether the seabed is hard or soft
• measure the speed of the boat and the distance traveled
• show the water temperature
We are sure you will find the FishFinder L365 to be one of the most useful
devices on your boat.
Fig. 1-1
Typical Installation
Introduction
PWR
SETUP
CLEAR
FishFinder 365
Display Unit
Optional Thru Hull
Transducer
Transducer mounted
in quick release
transom bracket
PAGE
Raymarine
L365

2
Introduction
System Components
The FishFinder L365 consists of a compact display unit connected to a
transducer. The transducer is attached to the boat and extends into the
water.
Standard Equipment
When you unpack your FishFinder L365, you should find the following
standard equipment in the carton. If any items are missing, please notify
your Raymarine dealer immediately, or contact the Customer Service
Department at Raymarine at 1-800-539-5539, ext. 2333. Please provide
the serial number of the FishFinder when reporting any missing items.
Description PartNo.
FishFinder L365 display unit E61010
Quick-release swivel-mount bracket
(with mounting hardware) M78945
DC power cable M99-146
Instruction manual G627296-3
Four #10 x 3/4”ss mounting screws —
Standard Transducers
Depending on which model of the L365 you have purchased, the box will
include one of the transducers listed below:
Description PartNo.
Transom-mount transducer (with speed
and temperature sensors, including
mounting bracket and hardware) M78898
Bronze thru-hull transducer (with
speed and temperature sensors) M78923
Optional Accessories
Optional accessories and parts can be purchased directly from
Raymarine. For prices and ordering information, please call the Parts
Department at [phone] ext. 2333.

3
Description Part No.
Sidelooker transom-mount transducer M78930
Sidelooker transducer for trolling motor mounting.
Companion with M78928 downlooker depth/temp
transducer, with 12 ft. (3.6 m) cable
and hardware M78929
Extension for transducer cable (15 ft, 5 m) M99-140
Extension for transducer cable,
for Sidelooker transducer (15 ft, 5 m) M99-139
Flush-mounting kit (with hardware and
mounting template) M99-137
Fairing block for M78923 thru-hull
transducer (Lexan®) M99-142
Low profile plastic thru-hull transducer
(Valox®plastic, sensor for depth only) M78922
Bronze thru-hull transducer
(sensor for depth only) M78921
In-hull/trolling motor transducer (for installation in
fiberglass hull only, or mounting on trolling motor,
including hardware for either installation) M78928
Angled in-hull transducer (for installation
in fiberglass hull only, where deadrise
angle is 10°to 22°) M78946
Plastic thru-hull transducer (Valox®plastic, with
speed and temperature sensors, used with depth-
only transducers M78922, M78928, M78946) M78937
Transom-mount speed and temperature
sensor (used with depth-only transducers
M78922, M78928, M78946) M78936
Replacement transom transducer
mounting bracket kit M99-148
Soft storage/carrying case M99-114
Transducer switch box (select between two L365
FishFinder displays, using one transducer) M99-136
Replacement paddle wheel kit (for transom-
mount transducer) M99-143
Replacement paddle wheel kit
(for thru-hull transducer) M99-144
Introduction

4
2 – Installation
The installation process has four parts:
•Mounting the transducer
•Mounting the display unit
•Connecting the cables for the transducer and power supply
•Calibrating the display unit
About the Transducer
Several different kinds of transducers can be used with this unit. The
transom-mount style, used most often, and in-hull types are shown in
Fig. 2-1.
Besides measuring water depth, the transducers also have two other
sensors: a paddle wheel which detects the speed of the boat, and a
sensor for the water temperature. The display unit uses the speed
information to calculate the distance the boat has traveled. An optional
transducer, the Sidelooker, detects objects by looking out to the sides of
the boat.
Since the transducer is very important to the operation of the FishFinder,
it is vital that the transducer be mounted correctly. The transducer will
give the most reliable readings if it looks into water which is smooth and
undisturbed. If you place the transducer so bubbles or turbulence flow
across the face of the unit, the system may give inaccurate readings.
There are three important rules when mounting any type of transducer:
•The transducer should be continuously covered by water when the
boat is moving. (If the transducer is mounted near the side of the
boat, it may be exposed when the boat is turning.)
•The transducer should be placed where turbulence or bubbles will not
pass directly over the face of the unit. Don’t place the transducer
behind any running strakes, intakes, or thru-hull fittings which create
turbulence.
•The transducer should be mounted where it will not be affected by the
wash from the propeller(s).
Installation

5
M78898
Transom-mount
transducer
M78923
Thru-hull
transducer
M99-142
Fairing for
thru-hull transducer
M78946
In-hull
transducer
M78930
Sidelooker
transducer for
transom mount
M78929
Sidelooker
transducer for
trolling motor
Installation
Fig. 2-1
Transducer
Types
Selecting the Correct Type of Transducer
Before you begin the installation, double-check to be sure you have the
correct type of transducer. Each kind of transducer is designed for a
particular type of use. In this manual we will include detailed mounting
instructions for the transom-mount transducer. We will also include some
general information on the other types. For detailed information on these
other transducers, see the instructions which are packaged with the unit.
Use a transom-mount transducer if –
. . . your boat has an outboard or inboard-outboard engine(s), and if you’re
planning to use the Sidelooker option. This type of transducer must be
mounted ahead of or beside the propeller(s). Do not use this type of
transducer for a boat with a straight-shaft inboard engine.
Use a thru-hull transducer if –
. . . your boat has a straight-shaft inboard engine. This type of transducer
is installed in a hole drilled through the hull.
Use an in-hull transducer if –
. . . you have a high-speed boat or if, for some reason, you cannot use a
transom-mount or thru-hull transducer.The hull may be no more than 1" thick.

6
Use a trolling motor transducer if –
. .. you want to attach the transducer to a trolling motor. (Not recom-
mended for deep-water operations.)
Use a Sidelooker transducer if –
. . . you need a way of searching for fish on either side of the boat. This
type of transducer is attached to the bracket of the transom-mount
transducer or to the shaft of the trolling motor.
Assembling the Transducer Bracket
Fit together the two parts of the transducer bracket as shown in Fig. 2-2.
When the installation is complete, the parts snap together as shown.
Positioning the Transom-Mount Transducer
Begin by finding the best location for the mounting bracket. Here are the
rules:
•If your boat has one propeller (outboard or inboard-outboard), mount
the transducer about 18↑(455 mm) to the side of the centerline of the
boat. See Fig. 2-3. Choose the side that is on the downstroke of the
propeller. (This is usually the starboard side of the boat.) This will
reduce interference caused by air bubbles.
•If the propeller can be turned to steer the boat, allow at least 2" (50
mm) beyond the swing radius of the propeller. This will prevent the
Installation
Fig. 2-2
Assembling
theTransducer
Bracket
Lower the transducer
and snap in the
release clip
Attach the
two parts Bracket is installed upside down
NOTTHIS!LIKETHIS!

7
Fig. 2-3
Transducer
Mountedon
Transom
Installation
Transducer in
released position
10"
(254 mm)
Allow a clearance
of at least 10
inches (254 mm)
Fig. 2-4
Transducer
Bracket,
SideView
propeller from damaging the transducer when it is turned. After
installation, check the clearance by turning the wheel so the propeller
swings toward the transducer. There should always be a 2”(50 mm)
clearance.
•If your boat has twin propellers (outboard or inboard-outboard), place
the transducer near the centerline of the boat.
• Do not mount the transducer behind any hull fittings, intakes, or other
parts which extend from the hull. These may cause turbulence or air
bubbles.

8
123
Insert screws 1 and 3
1/4" from the bottom of
slots, and screw 2
1/4" from the top of the
slot to allow room for
adjustment. Correct
alignment
If screws are inserted
this way, it won’t be
possible to make the
height adjustment.
Incorrect
alignment
Fig. 2-6
Mounting
theTransducer
Fig. 2-5
CorrectMounting
Position
Vertical transom –
place wedge this way
Average transom angle–
no wedge necessary Sloping transom– place wedge this way
For fiberglass hull –1/8" to 1/4" (3.2 to 6 mm)
For aluminum hull –1/4" to 3/8" (6 to 9 mm)
Rivets on the hull are
creating bubbles.
Lower the transducer
a bit.
The bow of the transducer
is above the bottom of the
transom, creating
cavitation.
The rear of the transducer
is too high, creating
cavitation.
2 to 5 2 to 5 2 to 5
No! No! No!
Installation

9
•The bracket has a quick-release mechanism. This may reduce
damage by allowing the transducer to flip up if it hits any debris or the
bottom. See Fig. 2-4. Allow enough clearance above the transducer
so that it can swing upward completely. This is about 10" (254 mm)
measured from the bottom of the transom.
•If considering the Sidelooker option, look for a mounting location
where the Sidelooker array will not be blocked by the engine housing
or other mounted hardware.
•If the boat will be carried on a trailer, be sure the transducer will not
hit any rollers, bunks or fittings on the trailer.
Mounting the Transom-Mount Transducer
1. On a boat with a fiberglass hull, the leading edge of the transducer
should extend 1/8" (3.2 mm) to 1/4" (6 mm) below the bottom edge of
the hull. See Fig. 2-5. On an aluminum hull, the transducer should
extend a bit more –1/4" (6 mm) to 3/8" (9 mm). If the boat will be
operated at high speeds, the transducer may be mounted closer to
the centerline of the hull.
2. The lower surface of the transducer should tilt down toward the rear
at a slight angle (2°to 5°). The mounting bracket includes a wedge.
Depending on the angle of the transom on your boat, you may need
this wedge to get the correct angle for the bottom of the transducer.
3. Looking at the rear of the boat, be sure the bracket is vertical (perpen-
dicular to the water line).
4. Hold the bracket (and the wedge, if used) against the transom and
trace the positions of the screw slots.
5. Remove the bracket. See Fig.2-6. The screws in the outer slots
should be placed about 1/4" (6 mm) up from the bottom of each slot.
The screw in the center slot should be placed 1/4”(6 mm) down from
the top. (This will allow you to adjust the bracket up or down a bit.)
Drill pilot holes 3/4" (19.1 mm) deep. Use a 9/64" (3.6 mm) drill bit.
To prevent drilling too deeply, wrap masking tape around the drill bit
about 7/8" (22 mm) from the tip. Drill in only as far as the tape
marker.
If you are attaching the bracket to a fiberglass hull, you can minimize
any surface cracking of the gel coat. Before drilling each pilot hole,
drill a shallow hole (chamfer) at each location about 1/16" (1.5 mm)
deep. Use a 1/4" (6 mm) drill bit.
Installation

10
Installation
6. Attach the bracket to the hull using the panhead screws with flat
washers. Before you tighten the screws, apply a good-quality marine
sealant to the pilot holes. This will protect the hull from water penetra-
tion.
Do not tighten the screws completely yet.
7. Move the bracket up or down so that the leading edge of the trans-
ducer has the clearance shown in Fig. 2-5.
8. Once the bracket is in the correct position, you can tighten the
screws.
Mounting the Optional Sidelooker Transducer
1. The Sidelooker transducer allows the display unit to check the water
to either side of the boat. This is helpful when you are looking for fish
or structure near river banks, or under docks or piers.
2. The M78930 Sidelooker transducer is attached to the same mount-
ing bracket used with the transom-mount transducer. See Fig. 2-7.
Begin by installing the transom-mount bracket as described earlier.
3. Remove the two screws and brackets covering the paddlewheel.
4. Attach the Sidelooker transducer to the top of the transom mounting
bracket. Use the four panhead screws supplied. The fit should be
snug, but do not overtighten the screws.
Fig. 2-7
Installingthe
Sidelooker
Transducer

11
Installation
5. Run the Sidelooker cable beside the depth cable for the transom-
mount transducer.
Installation Notes – Thru-Hull Transducer
Detailed instructions for this installation will be included with the trans-
ducer. In this section, we will note just a few important points.
1. Earlier we listed three general rules for placing transducers. All of
these rules apply when you are mounting a thru-hull transducer. Here
are some other rules for selecting the best mounting location:
For planing hulls –Install in the flat planing area near the stern.
Always install forward of the propeller(s) and shaft(s).
For small displacement hulls –Install near the centerline of the hull
and 1/3 of the way forward from the stern. Always install forward of
the propeller(s) and shaft(s).
For large displacement hulls –Install near the centerline of the hull
and 1/3 of the way aft from the bow. Always install forward of the
propeller(s) and shaft(s).
For sailboats –Install forward of the leading edge of the keel, to one
side and near the centerline of the hull.
2. Choose a location where you can easily reach the transducer from
inside the boat. This will allow you to service the unit. Allow at least
6" (152 mm) of headroom above the transducer.
3. When choosing a mounting location, drill a small pilot hole (1/8" or 3.2
mm) from the inside of the hull. Before you drill the hole, be sure you
will be able to reach the large nut on the top of the unit, and that there
will be enough clearance for the cable. If there is a strake or other
feature on the hull, drill from the outside of the hull instead. (This
small hole can be filled easily if the mounting location is not suitable.)
4. The position of the transducer is especially critical on high speed
boats (capable of more than 20 knots). Check the locations of the
transducers on similar boats before installing the transducer in your
own boat. Choose the location which will offer the best performance.
5. If the bottom of the hull at the mounting location is flat, you can mount
the transducer directly through the hull. If the hull rises at an angle
(the “deadrise angle”) of more than 10°, you must include a mounting
block or “fairing.”The transducer must be mounted in a vertical
position. Attach the fairing block to the hull as firmly as possible. This

12
fairing block must be able to resist the drag of the water against the
hull, and must also be completely waterproof.
6. If the hull of the boat has a core-type hull, you will need to follow
some special mounting procedures. The core material must be
protected from any water which may leak from the inside of the boat.
(If the core material is allowed to remain wet, it may rot and weaken
the hull.)
7. When working with the transducer, support it by holding the body of
the unit or the rings. Do not hang the transducer from the cable.
8. It is very important to seal the opening around the transducer using a
high-quality marine sealant suitable for underwater use. After
installation, do not leave your boat in the water for any amount of time
without checking for leaks.
Installation Notes – In-Hull Transducer
Detailed instructions for this installation will be included with the trans-
ducer. In this section, we will note just a few important points.
1. Choose the best mounting location:
For outboard powerboats –Install as far aft as possible
For inboard/outboard powerboats –Install close to the engine(s)
For inboard powerboats –Install forward of the propeller(s) and
shaft(s)
For sailboats –Install near the centerline of the hull and forward of
the leading edge of the keel
2. An in-hull transducer may only be installed in a fiberglass hull which is
no more than 1" (25 mm) thick. The in-hull transducer may not be
installed in wood or aluminum hulls.
3. Use the standard in-hull transducer if it will be installed in a flat part of
the hull, or a section with no more than 10°of deadrise. Use the
angled in-hull transducer if the mounting location has up to a 22°of
deadrise.
4. Do not try to compensate for the angle of the hull by fairing the epoxy
adhesive on the face of the transducer.
5. Use the epoxy supplied with the in-hull transducer, or an equivalent
epoxy glue. Do not use any other type of adhesive, including silicone
or RTV adhesive.
Installation

13
Fig. 2-8
Installingthe
Sidelooker
Transducer on a
Trolling Motor
Installation Notes – Trolling Motor Transducer
Both Downlooker and Sidelooker transducers may be installed on a
trolling motor. See Fig. 2-8.
Detailed instructions for these installations will be included with the
transducer(s). The Downlooker transducer is mounted on the horizontal
gear case of the motor. The Sidelooker transducer is attached to the
vertical support tube. These installations are simple, but it is important to
keep these points in mind:
1. Keep the Sidelooker transducer fully submerged. The transducer will
only produce an image if it is immersed in water.
2. Keep the Sidelooker transducer clear of weeds or debris.
3. When the position of the trolling motor is changed, the field of view of
the Sidelooker also changes. The Sidelooker can be aimed at
interesting echoes, but can also be positioned so that it is looking
back at the hull. Be aware of the position of the Sidelooker trans-
ducer.
Installation

14
Fig. 2-9
Installation
onBracket
Installation Notes – Transducer for Speed and
Temperature Only
This type of transducer may be used with a thru-hull transducer which
reads depth only.The speed/temperature transducer is attached to the
transom of the boat. Detailed instructions for this installation will be
included with the transducer.The cable for this transducer uses a “Y”
connector. See the notes on “Installing the Transducer Cable.”
Mounting the Display Unit – Standard Mount
You may mount the display unit on any flat surface using the bracket
supplied. See Fig. 2-9. (There is also an optional kit which allows you to
flush-mount the display in a flat panel or dashboard). Follow these
instructions if you are using the standard mounting bracket:
1. The “LCD”type display used on this unit is easier to see from certain
angles. Before selecting a permanent mounting location, make
temporary power connections and turn on the unit. This will allow you
to test the visibility of the display from several different angles.
2. Remove the display unit from the bracket by pressing on the large
button in the center of the bracket. See Fig. 2-9.
3. Mount the base of the bracket using the supplied screws.
Installation
PWR
SETUP
PAGE
CLEAR
Raymarine
To release the
display from
the base,
press on the
right and left
sides until you
hear the clicks.
Slide the
display out
of the bracket.
The display can
be turned from
side to side.
The angle of
the display
can be changed.
FISHFINDER
L365

15
Fig. 2-10
Dimensions
Installation
Hole 3/16" (5 mm)
3-29/32"(99 mm)
4-7/32"(107 mm)
63/64"
(25 mm)
1-13/32"
(36 mm)
Countersink
3/8" (10 mm)
5-7/32" (133 mm)
5-9/32"
(134 mm)
6-3/4"
(172 mm)
4-9/32"
(109 mm)
1-3/4"
(44 mm)
2-23/32"
(69 mm)
2-25/32"
(70 mm)
2-21/32"
(67 mm)