GPSMAP 276C Features:

3.8-inch diagonal, 480 x 320 pixel, 256-color TFT screen with adjustable LED backlight
Unit dimensions: 5.7″W x 3.2″H x 1.9″D
Adjustable marine mounting bracket
Stores up to 3,000 user waypoints, 50 reversible routes (300 waypoints per route)
10,000 point automatic track log; 15 saved tracks
Rechargeable lithium battery offering 5-15 hours of use (depending on backlight settings)
WAAS-enabled, 12 parallel channel GPS receiver
Adjustable quad helix receiving antenna with remote antenna capability
Built-in basemap with automatic routing and turn-by-turn directions
Accepts standard Garmin data cards and pre-programmed data cards
Provides separate serial and USB interfaces
2 NMEA serial ports
Offers BlueChart night mode for easier viewing at nighttime
Large numbers option for easy viewing
Position formats include Lat/Lon, UTM, Loran TDs, Maidenhead, MGRS, User, and more
Provides a course deviation indicator when navigating
Project your position on the map with the configurable complex heading line
Built-in tide tables and celestial tables for sun and moon calculations
Alarms: anchor drag, arrival, off-course, proximity waypoint, and clock
Water resistant to IEC 60529 IPX7 standards (submersible in one meter of water for 30 minutes)Box Contains:
GPSMAP 276C
Americas Autoroute Basemap
USB-PC interface cable
Power/data cable
Marine mount
Rechargeable lithium battery pack
AC adapter
Trip & Waypoint Manager CD
Manual
Quick-start guide