Hi I was just wondering if there was any alternate GPS i could use on the N810. I need it to be able to tell me where I am, plan routes and things like that. I have heard about using it with BT but im unsure how to do this. Also, how do I go about using the GPS chip inside it? If anyone could help me with this id really appreciate it!

Try a search of these forums Robbo. This question has been answered many times in great detail.

robbo1869,
A GPS cannot plan routes and things like that, as you ask. Only a navigation system can do that. A GPS is simply a little device or chip that will connect to the GPS satellites and give you location, speed/direction if applicable, and altitude. Normally you'll feed this info into some sort of computer program which could then do interesting things like showing you a map and so on. The computer program combined with the GPS is often called a navigation system.

The N810 has a built-in GPS and comes with a navigation application and maps (to get routing with the navigation application you have to pay extra).

It's possible to use a different, external GPS with the N810 (any BT-GPS which supports the NMEA protocol), as well as additional software - e.g. Maemo Mapper, which is not really a full-blown navigation system, it's a great mapping system with some navigation capabilities. There's also an up-and-coming alternative piece of software for navigation, search the forums (I think it's called roadmap or something - I didn't look deeply, as it's for north america only because of the map sources).