Garmin GSD 26 Installation Instructions Manual page 5

Grounding the Sounder
The chassis ground post is located on the exterior of the chassis, adjacent to a corner mounting hole.
1 Connect the chassis ground post to the boat water ground circuit.
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,
sensors (Connecting the Sounder,
GSD 26 Installation Instructions
page 2) and connect the power, marine network, transducer, and
page 3).
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