For boaters and watersports enthusiasts who want to run with the best, the rugged GPSMAP 78s features a 3-axis compass, barometric altimeter, crisp color mapping, high-sensitivity receiver, new molded rubber side grips, plus a microSD™ card slot for loading additional maps. And it floats!
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Features:
    #Large 65k color outstanding daylight viewable TFT screen - 41 x 56mm and 160 x 240 pixels.
    #Special paperless Geocaching Navigation Mode.
    #Trip Computer: current speed, average speed, resetable maximum speed, trip timer and distance.
    #Anchor Drag, Arrival & Off course Alarms.
    #2000 waypoints with name and graphic symbol, 10 nearest (automatic) and 10 proximity.
    #200 reversible routes of upto 250 waypoints.
    #Tracklog Points: 10,000 200 saved tracks.
    #Area calculation feature calculates the size of an area that has been circumnavigated. Ideal for measuring areas of fields, bodies of water etc.
    #Best Hunting and Fishing Times.
    #External antenna option (GPA918).
    #Waterproof case to IPX7 standard - floats in water .
    #PC/USB Interface cable and wrist strap included.
    #Custom Maps Compatible .
    #Internal Memory: 1.7GB, MicroSD External Memory slot.
    #3 Axis Electronic Flux gate Compass - 1 degree resolution.
    #Elevation Computer: Current elevation, resetable minimum and maximum elevation, ascent/descent rate, total ascent/decent, average and maximimum ascent/descent rate.
    #Barometric Altimeter - Elevation Accuracy: 3m with calibration.
    #Local and 12 hour pressure trend.
    #Range: -2,000 to 30,000 feet.
    #High Speed USB & NMEA0183 interface.
    #Battery Life: 2 AA's (not included) up to 20 hours.