The GPS reciever uses geostationary satellites (up to 24 sats, for military and 12 for domestic) I use one in conjunction with Ozi Explorer and my laptop as a navigational aid. There are routing software available for them but they do have good points and bad points, like some blocked roads it will tell you to go through
I have a magellan Map-330 which is a hand held unit, its good cos I can connect it to my telescope so it knows where I am
