Compared across 4 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.
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The GSD 25 is a black-box sonar module that adds high-power CHIRP fishfinding to a compatible Garmin chartplotter over the Garmin Marine Network. It runs dual-channel 1 kW CHIRP plus CHIRP DownVü and SideVü scanning, with adjustable frequency pairs and target separation claimed down to 5,000 feet. It suits offshore and deep-water anglers building a networked helm, not casual inland users. Against Garmin's built-in sonar in mid-range combo units, it buys more power, clearer bottom tracking and side/down scanning on a big display; it needs a compatible MFD, transducers and wiring, so it is a system upgrade rather than a standalone unit.
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Store links may earn us a commission. Some prices via Klarna.
Lowest price we've seen: $792.12 on Nov 8 at The Twister Group. Tracked across 4 stores since Nov 8.
Owner discussion centers on the deep-water clarity the 1 kW CHIRP delivers and on the install effort it takes to get there. Most who bought it for offshore work report better target separation than built-in sonar.
The Garmin GSD 25 Premium Sonar Module is a remote network sonar module for fishfinding and bottom tracking. It has dual-channel 1 kW CHIRP sonar and supports Garmin CHIRP DownVü and SideVü scanning sonar.
Target details are clear enough to distinguish small, closely spaced fish down to 5,000 feet. The CHIRP frequencies can be adjusted (low/medium, low/high or medium/high) to optimize sonar performance. The module is waterproof to IPX7.
