Garmin GPSMAP 640Physical & Performance: |
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| Unit dimensions, WxHxD: | 5.9"W x 4"H x 1.9"D (15.0 x 10.2 x 4.8 cm) |
| Display size, WxH: | 4.5"W x 2.7"H (11.4 x 6.9 cm); 5.2" diag (13.2 cm) |
| Display resolution, WxH: | 800 x 480 pixels |
| Display type: | WVGA |
| Weight: | 17.3 ounces (490.4 g) |
| Battery: | rechargeable lithium-ion |
| Battery life: | up to 9 hours |
| Waterproof: | yes (IPX7) |
| Antenna: | internal |
| NMEA input/output: | NMEA 0183 |
| RoHS version available: | yes |
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| Basemap: | yes |
| Preloaded maps: | yes (coastal U.S. and North American road maps) |
| Ability to add maps: | yes |
| Built-in memory: | internal solid state |
| Accepts data cards: | SD™ card slot |
| Waypoints/favorites/locations: | 1500 (marine mode); 1000 (automotive mode) |
| Routes: | 50 (marine mode); 10 (automotive mode) |
| Track log: | 10,000 points, 20 saved tracks (marine mode); 10,000 points, no saved tracks (automotive mode) |
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| Garmin radar compatible: | no |
| Garmin sonar compatible: | no |
| CANet® compatible: | no |
| Garmin Marine Network™ compatible: | no |
| Touchscreen: | yes |
| Supports AIS (tracks target ships' position): | yes |
| Supports DSC (displays position data from DSC capable VHF radio): | yes |
| Audible alarms: | yes |
| Tide tables: | yes |
| Hunt/fish calendar: | no |
| Sun and moon information: | yes |
| 3-D map view: | yes (with optional BlueChart g2 Vision card) |
| Auto Guidance: | yes (with optional BlueChart g2 Vision card) |
| Automatic routing (turn by turn routing on roads): | yes |
| XM WX Weather & Radio for U.S. compatible: | no |
| Voice prompts (e.g. "Turn right in 500 ft."): | yes |
| Remote control: | no |
| Headphone jack/audio line-out: | yes |
| Audio/video input/output: | no |
| Portable: | yes |
| Automotive/motorcycle-friendly: | yes |