High-sensitivity, Waas-enabled Gps Receiver Provides Peak Performance In Any Environment Lightweight, Compact & Waterproof Features A 1.7h X 1.3w Screen With 256-level Color Tft Display Built-in Basemap With Automatic Routing Capability Connects To Computer's Usb For High-speed Map Downloads Includes Micro Secure Digital Card (tm) Card Slot For Optional Mapsource(r) Mapping Software Pre-programmed Micro Secure Digital Card (tm) Cards Available With Map Information Including Topographic Maps, Bluechart(r) Marine Charts, Detailed Inland Lake Maps & Turn-by-turn Street Data Based On Premium Navteq (tm) Mapping Data Automatic Track Log With 20 Saved Tracks Stores Up To 1,000 Waypoints & 50 Routes Barometric Altimeter & Electronic Compass Provides Automatic Turn-by-turn Directions With Optional Auto Navigation Kit Audible Beeper Alarm With Configurable Tones 4-way Cursor For Smooth, 1-hand Operation 25-hour Battery Life With 2 Required Aa Batteries Limited 1-year Warranty more info