Receiver: WAAS-enabled, 12 parallel channel GPS receiver

Display: 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

Waypoints: Stores 3,000 waypoints and 50 reversible routes

Tracks: 10,000 point automatic track log saves up to 15 tracks

Battery life: Rechargeable lithium-ion battery offers 4 to 15 hours of use (4 hours with GXM 30 and 15 without GXM 30)

Water resistant up to IEC 60529 IPX7 standards (submersible in one meter of water for 30 minutes)

Preloaded with U.S. marine detail charts utilizing g2 technology

Built-in street navigation with voice prompts, using included cable and speaker

Accepts the latest (optional) BlueChart g2 data cards

Add optional GSD 21 for full-feature sonar capability

Add optional GXM 30 antenna for XM WX Satellite Weather

Provides tides and built-in celestial information

NMEA 0183 input and output

Removable quad helix antenna

Single knob tilt/swivel mount

جی پی اس دریایی گارمین MAP478

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