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Fishfinder 300C Installation Instructions

Compare the contents of this package with the packing list on the box. If any pieces are missing, contact your Garmin dealer immediately. 

Before you begin the installation:

Read and follow the instructions to install the Fishfinder 300C.

Gather the appropriate fasteners and tools.

Verify that all cables can reach the Fishfinder 300C mounting location and the transducer.

Wear safety goggles and a dust mask when drilling, cutting, or sanding.

If you experience difficulty installing the Fishfinder 300C, contact Garmin Product Support or contact a professional installer.

WARNING

: See the 

Important Safety and Product Information

 guide in the product box for product warnings and other important 

information.

To install and use your Fishfinder 300C:

1.  Select a location.

2.  Mount the Fishfinder 300C.
3.  Install the transducer.
4.  Install the wiring harness.

5.  Test the installation.

Step 1: Select a Location for the Fishfinder 300C

Consider the following when you select an installation location: 

Provide optimal viewing as you operate your vessel.

Allow easy access to the keypad on the Fishfinder 300C.
Is strong enough to support the weight of the Fishfinder 300C and protect it from excessive vibration or shock.
Allow room for the routing and connection of the cables. There should be at least a 3-inch (8 cm) clearance behind the case. 

DO NOT mount the Fishfinder 300C in an area that is exposed to extreme temperature conditions.

 

NOTE: 

The temperature range for the Fishfinder 300C is from 5°F to 131°F (from -15°C to 55°C). Extended exposure to temperatures exceeding this 

range (in storage or operating conditions) may cause failure of the LCD screen or other components. This type of failure and related consequences are 

not covered by the manufacturer’s limited warranty.

Step 2: Mount the Fishfinder 300C

You can mount your Fishfinder 300C in one of two ways:

Bail Mount—mount the Fishfinder 300C onto the bracket that attaches to the console or overhead.
Flush Mount—use the flush mount kit to mount the Fishfinder 300C into a flat panel.

Bail Mounting the Fishfinder 300C

The Fishfinder 300C is suitable for mounting in exposed locations or at the navigation station. The included tilt mounting bracket can be used 

for console or overhead mounting. Bail mounting requires the following tools and hardware:

Three of the included number 8 (4.2 × 1.4 DIN7981) ANSI mounting screws
Phillips-head screwdriver (not included)
Drill and drill bit (not included)
Center punch and hammer (not included)











December 2007 

190-00864-03 Rev. B 

Printed in Taiwan

Summary of Contents for Fishfinder 300 ML

Page 1: ...shfinder 300C and protect it from excessive vibration or shock Allow room for the routing and connection of the cables There should be at least a 3 inch 8 cm clearance behind the case DO NOT mount the...

Page 2: ...ur of the included number 8 ANSI 4 2 1 4 DIN7981 mounting screws flush mounting the Fishfinder 300C requires the following tools Phillips head screwdriver Drill and drill bit refer to Drill Size Table...

Page 3: ...ts Some transducers may have to be installed by a professional marine installer CAUTION DO NOT cut the transducer lead or any part of the transducer cable Cutting the transducer cable voids your warra...

Page 4: ...til it touches the mounting bracket and then tighten 1 4 turn more Do not overtighten 6 Route the 30 foot 9 m transducer cable using the supplied cable ties to secure the cable to the motor shaft You...

Page 5: ...he pilot holes approximately 1 25 mm deep at the marked locations To avoid drilling the holes too deep wrap a piece of tape around the bit at 1 25 mm from the point of the bit 3 Apply marine sealant t...

Page 6: ...ltage because this can damage the Fishfinder 300C and void the warranty Note During a typical installation use only the red and black wires The other wires do not have to be connected for normal opera...

Page 7: ...3 device 1 Follow the instructions in Step 4 Install the Wiring Harness on page 6 For Garmin units the ground black wires serve as NMEA ground and must be attached together or on the same terminal Ref...

Page 8: ...nt transducer installation 1 Begin testing the installation at a slow speed If the sonar appears to be working properly gradually increase boat speed while observing sonar operation If the sonar signa...

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