Speed sensor calculates the speed of the water flowing past your transducer.

COMPATIBILITY:

The compatibility of this item includes, but is not necessarily limited to, the following:

GPSMAP 178
GPSMAP 178C
GPSMAP 198C
GPSMAP 188
GPSMAP 188C
Fishfinder 320C
Fishfinder 250C
Fishfinder 250
Fishfinder 240

Garmin Part # 010-10279-01