Parallax used to have a GPS application note I could point you to. But I think they took it down after the whole 9/11 thing. Don't want terrorists building self guiding projectiles!!!
I'm eventually going to work on an app that will read my Earthmate and display info onto a 40x4 LCD, and buffer the data to my computer, so I can use my computer as well. Hopefully both at the same time. I'll be using a Scenix chip though, instead of a pic. But if your asking questions like this, I'd recommend trying your hand at the
Basic Stamp or the
BasicX. At $50, both are a little expensive for my taste (I'm such a cheap bastard I absolutely had to learn Assembly). Pic's and the Scenix chips are considerably cheaper at under $10 a pop.