Garmin GSD 26 Installation Instructions

Garmin Sounders Installation Instructions - GSD 26.
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GSD™ 25 Installation Instructions

To obtain the best performance and to avoid damage to your 

boat, install the device according to these instructions.
Read all installation instructions before proceeding with the 

installation. If you experience difficulty during the installation, 

contact Garmin® Product Support.

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.

Important Safety Information

 WARNING

See the Important Safety and Product Information guide in the 

product box for product warnings and other important 

information.
You are responsible for the safe and prudent operation of your 

vessel. Sonar is a tool that enhances your awareness of the 

water beneath your boat. It does not relieve you of the 

responsibility of observing the water around your boat as you 

navigate.

 CAUTION

Failure to install and maintain this equipment in accordance with 

these instructions could result in damage or injury.
Always wear safety goggles, ear protection, and a dust mask 

when drilling, cutting, or sanding.

NOTICE

When drilling or cutting, always check what is on the opposite 

side of the surface.
This equipment must be installed by a qualified marine installer.

Installation Preparation

NOTICE

This device must be installed according to these instructions to 

get the best possible performance. If you experience difficulty 

with the installation, contact Garmin Product Support.

Because every boat is different, you must carefully plan the 

GSD 25 sounder installation.
Select a mounting location.
Mount the sounder.
Connect the sounder to the Garmin Marine Network and to 

power.

Connect the sounder to the transducer.
Tools Needed
• Drill and drill bits

• #2 Phillips screwdriver
• Cable ties (optional)
• Marine sealant (optional)

Mounting the Sounder
Mounting Location Considerations
• The sounder must be mounted in a location where it cannot 

be submerged.

• The sounder must be mounted in a location with adequate 

ventilation where it will not be exposed to extreme 

temperatures.

• The sounder should be mounted so that the LEDs are visible.
• The sounder should be mounted so that the power and 

network cables can be easily connected.

• The sounder should be mounted so that the transducer cable 

can be connected. If required, transducer extension cables 

are available through your Garmin dealer.

Mounting the Device

NOTICE

If you are mounting the bracket on fiberglass with screws, it is 

recommended to use a countersink bit to drill a clearance 

counterbore through only the top gel-coat layer. This will help to 

avoid any cracking in the gel-coat layer when the screws are 

tightened.
Stainless-steel screws may bind when screwed into fiberglass 

and overtightened. Garmin recommends applying an anti-seize 

lubricant to the screws before installing them.

Before you mount the device, you must select a mounting 

location and determine the mounting hardware needed for the 

surface.
NOTE: Mounting hardware is included with the device, but it 

may not be suitable for the mounting surface.
Place the device in the mounting location and mark the 

location of the pilot holes.

Drill the appropriate pilot hole for one corner of the device.
Loosely fasten the device to the mounting surface with one 

corner and examine the other three pilot-hole marks.

Mark new pilot-hole locations if necessary, and remove the 

device from the mounting surface.

Drill the appropriate pilot holes for the other three marks.
Secure the device to the mounting location.

Connecting the Sounder

 WARNING

When connecting the power cable, do not remove the in-line 

fuse holder. To prevent the possibility of injury or product 

damage caused by fire or overheating, the appropriate fuse 

must be in place as indicated in the product specifications. In 

addition, connecting the power cable without the appropriate 

fuse in place will void the product warranty.

NOTICE

Do not force a cable into its port. Forcing the cable can damage 

the pins. If the cable is properly aligned, the cable should 

connect easily.

Before you connect the sounder to the network, power, and the 

transducer, you must mount the sounder (Mounting the 

Sounder).
Route the cables using the appropriate tie wraps, fasteners, 

and sealant to secure the cables along the route and through 

any bulkheads or the deck.

December 2014

Printed in Taiwan

190-01833-02_0A

0.597049s