Garmin GPSMAP 172

320 x 320-pixel, high-resolution, 10-level grayscale FSTN LCD screen with adjustable CCFL backlight
3.2" H x 3.2" W (4.5" diagonal) viewing area
4.9”H x 6.3”W x 2.8”D unit dimensions
State-of-the-art 200 MHz processor makes map redraw, panning, and zooming virtually instantaneous
Accepts Garmin data cards for up to 128 MB of map storage
WAAS-enabled for accuracy to within 3 meters
3000 user waypoints are automatically tagged with the date and time of creation
Stores 50 reversible routes with up to 50 waypoints each, plus MOB and TracBack modes
10,000 active track points and 1000 saved track points; database information can be stored on removable data cards and transferred to a PC or another unit
Sends, receives, and displays positioning data with DSC-equipped VHF radios
TracBack™ mode helps guide you back to points along a route
Waterproof: IEC 60529 IPX7 standards (submersible in one meter of water for up to 30 mins.)
Provides tides and celestial information
MapSource compatibility: Compatible with most MapSource products. See the product compatibility table (top, right) for a list of products that Garmin recommends with this software.