I recently had a look at this rather old unit and found it to be quite decent, the main weakness seemed to be the antenna (which dropped of under bridges), otherwise the software and touchscreen seemed to be very close to Nuvis (the replacement range for this)
Here is the original Garmin description for this device:
Description:
Talk about simple. The StreetPilot c320 comes with an SD card, DVD with detailed street maps and automatic routing. Whether you choose the c320, the European c310 with preprogrammed SD card or preloaded c330 and c340, their intuitive touch screen operation and big displays make them easy to use.
Navigate With Ease
The StreetPilot c320 offers everything you want in a car navigation system including automatic routing, crystal clear voice guidance, address lookup, 2D or 3D maps and an extensive database of points of interest. Simply touch the color screen to enter a destination, and the c320 takes you there with turn-by-turn voice directions. It also accepts custom points of interest (POIs) such as school zones and safety cameras and lets you set proximity alerts to warn you of upcoming POIs.
Customize Your Maps
If you travel one region, the StreetPilot c320 is the cost-effective way to go. The StreetPilot c320 comes with a DVD of City Navigator NT detailed maps and a 128 megabyte (MB) SD card for downloading map areas. After downloading map data, just plug the SD card into the c320 card slot and navigate. Looking for a preprogrammed unit and no downloads? Try the StreetPilot c330 or c340 which come with preloaded detailed maps for added convenience.
Take It With You
The portable c320 easily moves from vehicle to vehicle. Its suction cup windshield mount is a snap to install. The c320 also comes with a rechargeable lithium-ion battery for out-of-car route planning.
StreetPilot c320: Where to?
Features:
- City Navigator NT North America or Europe DVD & blank 128 MB SD card
- Fingertip touchscreen interface
- Look up addresses and points of interest
- Choose 2D or 3D map perspective
- Upload custom POIs, including alerts for speed zones and safety cams
- SD memory card expansion slot
Specifications:
Receiver:WAAS-enabled 12 parallel channel GPS Display:2.8” W x 2.1” H (3.5” diag.), 320 x 240 pixels; QVGA transflective TFT with 16-bit color; 64K colors; bright white LED backlight and touch screen Unit dimensions:4.4” W x 3.2” H x 2.8” D Weight:9.45 ounces Battery life:up to 8 hours