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4

Position the transducer so it is parallel to the bottom when in 

use.

5

Use the included cable ties to secure the transducer cable.

6

Route the transducer cable to the installation location of the 

sounder while taking these precautions.
• The cable should not be routed close to electrical wires or 

other sources of electrical interference.

• The cable must not be pinched when the trolling motor is 

deployed or stowed.

Testing the Installation

NOTICE

You should check your boat for leaks before you leave it in the 

water for an extended period of time.
Because water is necessary to carry the sonar signal, the 

transducer must be in the water to work properly. You cannot 

get a depth or distance reading when out of the water. When 

you place your boat in the water, check for leaks around any 

screw holes that were added below the water line.

Testing the Transom-Mount Transducer Installation

NOTICE

When adjusting the depth of the transducer, make the 

adjustments in small increments. Placing the transducer too 

deep can adversely affect the performance of the boat and put 

the transducer at risk of striking underwater objects.
Test the transom-mount transducer installation in open water 

free of obstacles. Pay attention to your surroundings as you test 

the transducer.

1

With the boat in the water, turn on the chartplotter.

2

Drive the boat at a slow speed. If the chartplotter appears to 

be working properly, gradually increase speed while 

observing the chartplotter.

3

If the sonar signal is suddenly lost or the bottom return is 

severely degraded, note the speed at which this occurs.

4

Return the boat to the speed at which the signal was lost, 

and make moderate turns in both directions while observing 

the chartplotter.

5

If the signal strength improves while turning, adjust the 

transducer so that it extends another 

1

/

8

 in. (3 mm) below the 

transom of the boat.

6

Repeat steps 2–4 until the degradation is eliminated.

7

If the signal does not improve, move the transducer to a 

different location on the transom, and repeat the test.

Cleaning the Transducer

Aquatic fouling accumulates quickly and can reduce your 

device's performance.

1

Remove the fouling with a soft cloth and mild detergent.

2

If the fouling is severe, use a scouring pad or putty knife to 

remove growth.

3

Wipe the device dry.

Software Update

You may need to update the device software when you install 

the device or add an accessory to the device.

Loading the New Software on a Memory Card

You must copy the software update to a memory card using a 

computer that is running Windows

®

 software.

NOTE: 

You can contact Garmin customer support to order a 

preloaded software update card if you do not have a computer 

with Windows software.

1

Insert a memory card into the card slot on the computer.

2

Go to 

www.garmin.com/support/software/marine.html

.

3

Select 

Download

 next to the software bundle that 

corresponds with your device.

4

Read and agree to the terms.

5

Select 

Download

.

6

If necessary, select 

Run

.

7

If necessary, select the drive associated with the memory 

card, and select 

Next

 > 

Finish

.

Updating the Device Software

Before you can update the software, you must obtain a 

software-update memory card or load the latest software onto a 

memory card.

1

Turn on the chartplotter.

2

After the home screen appears, insert the memory card into 

the card slot.

NOTE: 

In order for the software update instructions to 

appear, the device must be fully booted before the card is 

inserted.

3

Follow the on-screen instructions.

4

Wait several minutes while the software update process 

completes.

5

When prompted, leave the memory card in place and restart 

the chartplotter manually.

6

Remove the memory card.

NOTE: 

If the memory card is removed before the device 

restarts fully, the software update is not complete.

Registering Your Device

Help us better support you by completing our online registration 

today.
• Go to 

http://my.garmin.com

.

• Keep the original sales receipt, or a photocopy, in a safe 

place.

Contacting Garmin Product Support

• Go to 

www.garmin.com/support

 for in-country support 

information.

• In the USA, call 913-397-8200 or 1-800-800-1020.
• In the UK, call 0808 238 0000.
• In Europe, call +44 (0) 870 850 1241.

Specifications

Specification

Measurement

Transmit power

250 W (RMS)

Maximum depth*

244 m (800 ft.)

Frequencies**

From 145 to 240 kHz

Operating temperature range

From 0° to 40°C (from 32° to 158°F)

*Dependent upon the water conditions.
**Dependent upon the chartplotter or fishfinder model.

Garmin

®

 and the Garmin logo are trademarks of Garmin Ltd. or its subsidiaries, registered 

in the USA and other countries. These trademarks may not be used without the express 

permission of Garmin.

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