What is the purpose of bluetooth on a gps unit?”
Bluetooth on a GPS allows you to pair your GPS with your computer or (possibly) phone (a phone may include a GPS or, more likely, a GPS-like location function), which will provide location data for applications like Microsoft Streets & Trips, Google Maps/Earth, or other GPS-aware mapping applications. Bluetooth is a low-power “personal” area network (PAN) that allows nearby devices to communicate any sort of data they need. Wireless headsets for phones are a very common application, but there are other things to do with Bluetooth as well.
