Garmin Sounder Gpsmap 398 Internal Antenna The GPSMAP 398C Sounder offers depth contours, tide and current data, boat ramps, mile markers, hazards, marinas, campgrounds, area roads, and more. The unit accepts preprogrammed data cards and is compatible with the latest BlueChart g2 series marine cartography. The built-in 500-watt (RMS) sounder on the GPSMAP 398C features Ultrascroll for high-speed screen updates, and its Garmin CANet bus allows sounder display information to be shared with another chartplotter onboard.
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