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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.
Important Safety Information
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.
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.
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.
Transducers
A transducer is required to send and receive a sonar signal from the sounder. Proper transducer selection and
installation are critical to the operation of the device. Because mounting locations vary, see your local Garmin
dealer or contact Garmin Product Support for more information. Go to
transducer.
Installation Preparation
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 26 sounder installation.
1 Select a mounting location.
2 Mount the sounder.
3 Connect the sounder to the Garmin Marine Network and to power.
4 Connect the sounder to the transducer.
May 2022
GSD
26 Installation Instructions
WARNING
CAUTION
NOTICE
NOTICE
www.garmin.com/transducers
TA-2013/325
GUID-CD9D5480-1EC6-4A73-AB59-0037B3321584 v5
to select a

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Summary of Contents for Garmin GSD 26

  • Page 1 A transducer is required to send and receive a sonar signal from the sounder. Proper transducer selection and installation are critical to the operation of the device. Because mounting locations vary, see your local Garmin dealer or contact Garmin Product Support for more information. Go to www.garmin.com/transducers...
  • Page 2: Tools Needed

    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.
  • Page 3: Connecting The Sounder

    The grommets do not create a waterproof seal. If necessary, apply a marine sealant after installation to weatherproof around the grommet and the cable. You can purchase grommets from your Garmin dealer or directly from Garmin at www.garmin.com. Connecting the Device to a Transducer or Sensor...
  • Page 4: Preparing The Cable

    (Transducer Wire Color Tables, page 11) for specific examples of Garmin wire colors. 1 Connect the uninsulated section of each wire to the terminal block using a 3 mm flat screwdriver. 2 Connect the bare shield wire to one of the two ground posts under the terminal block using a #2 Phillips screwdriver.
  • Page 5 NOTE: The boat battery ground is an acceptable alternative if your vessel does not have a designated water ground circuit. 2 Mount the sounder (Mounting the Sounder, page 2) and connect the power, marine network, transducer, and sensors (Connecting the Sounder, page 3). GSD 26 Installation Instructions...
  • Page 6 You can use these diagrams to identify the connection points for your transducer wires on the GSD 26 terminal block. Locate your CHIRP/spread spectrum transducer model in the wiring color tables...
  • Page 7 Single-Element CHIRP/Spread Spectrum GSD 26 Installation Instructions...
  • Page 8 Dual-Element CHIRP/Spread Spectrum with Temperature and XID NOTE: The temperature and XID wires can be connected at either location. GSD 26 Installation Instructions...
  • Page 9 Dual-Element CHIRP/Spread Spectrum with XID NOTE: The XID wires can be connected at either location. GSD 26 Installation Instructions...
  • Page 10 Dual-Element CHIRP/Spread Spectrum with Separate Temperature Sensor NOTE: The temperature and XID wires can be connected at either location. GSD 26 Installation Instructions...
  • Page 11 Dual-Element CHIRP/Spread Spectrum with Separate Speed Sensor NOTE: The XID wires can be connected at either location. Transducer Wire Color Tables You can use these tables to help identify wire functions on certain Garmin or Airmar transducers. GSD 26 Installation Instructions...
  • Page 12 Airmar 509LHW Blue/White Bare Black/White Brown Bare White Orange Blue Bare Black Bare Airmar TM185M Brown White Orange Blue Bare Black Bare Yellow before 11/20/10 Can be connected to either Low Freq or High Freq terminal blocks. GSD 26 Installation Instructions...
  • Page 13: Blink Codes

    © 2014–2022 Garmin Ltd. or its subsidiaries Garmin ® and the Garmin logo are trademarks of Garmin Ltd. or its subsidiaries, registered in the USA and other countries. GSD and GMS ™ are trademarks of Garmin Ltd. or its subsidiaries. These trademarks may not be used without the express permission of Garmin.
  • Page 14 © 2014–2022 Garmin Ltd. or its subsidiaries support.garmin.com...

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