Sonar Capability
In addition, the GPSMAP 376C can also receive sonar data through the Garmin’s “black box” sounder, which offers 4,000 watts of power peak-to-peak (500 watts RMS) in a dual-frequency transducer (purchased separately).

GPSMAP 376C Features:

Can display animated NEXRAD weather radar and forecasts, current conditions, wave data, surf temperatures, and much more. (Satellite weather and audio are only available within XM’s signal coverage area.)
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
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 4-15 hours of use (depending on backlight settings)
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)
Package Includes:

GPSMAP 376C
Americas: Americas Autoroute
GXM 30 smart antenna
Marine mount
GXM 30 pole mount
Rechargeable lithium-ion battery
A/C charger
Power/data cable
USB cable
2 meter GXM 30 extension cable
Owner’s manual