Can I track my mobile GPS on a PC?

I really don't want to buy a 3rd device.

What is the best, cheapest option to add GeoTagging to my Nikon D50 pictures? Basically, I just want the simplest, most basic GPS track-recorder you can give me. My googling has yielded less than optimal results. I know that the Nikon D50 doesn't have...

I am starting to get into Geo-tagging my pictures and would like to continue. Right now my process is sort of crude due to the fact that I only give the general area of where I might have taken the picture. I am looking for information and suggestions...

I own a rino 520HCx and I wanted to know how to save the track log from the gps unit directly into the micro SD card inside the unit. I wanted to transfer track logs to the PC but it only reads through the micro SD card.

GPS with extremely large memory? I'm looking for something pretty much exactly like the Sony GPS-CS1 (reviewed here )... but that will allow me to download the data to a Mac when I'm done. (Though the GPS-CS1 mounts as a regular drive on a PC, it won...

What's a good GPS unit for hiking? I'm fine with a compass and topo map, but would like to track more detailed information like how long it actually took to get from point A to point B, what the elevation profile looks like, where I stopped for a rest...

If i want to place a GPS in a wallet and track it's movement from my PC how can I do it? where do I buy one?

I want to track several cars with gps installed in them (don't know what kind) and want to be able to monitor in real time their movements on a map (on a pc). I am looking for an fairly easy to implement solution and relatively cheap. Thank you