No subscription fees, its free. GPS is really a military thing as you have been seeing on TV. They put an error in the signal so the GPS you and buy is only good to get you within a 100 feet or so of your target. Then several years ago they turned off the error (so other governments could not figure out the math to the error) and GPS was good to around 35feet. I hear since we entered Iraq the error is turned back on, but I bet it will be turned back off this summer.
As far as units, I have a Lowrance Globalmap 100. I bought mine because a friend has one, and swares by it (plus he has all the software for it

)
Mine comes with a small LCD screen, and a map of North America that is pretty low detail. Then I can download detailed maps into the GPS from my computer using Lowrance software. (maps Lowrance supplies are around 10+ years old at least)
Now when you look at them there is 3 types.
Ones with no maps at all
Ones with low detail, small maps where you can download additional detail into them from software (software is extra).
Ones you could install in your car that is big enough to see the map as you drive.
At any rate, if you have to buy the GPS and the software, I would recommend any of the Garman GPS products. They have come a long way and are really good units, and all the software venders are using Garman commands so they can talk to the GPS from the laptop.
I use mine while walking, or riding dirtbikes, then I can download the route I just walked to Delorme topo software.
I also use it while driving on long trips. I have a cable that connects it to the laptop, and the GPS shows me exactly where I am on the map. I use Delorme Street Atlas 2003 for that.
Using GPS with the laptop while pulling the RV around has been the best thing that could happen to keep my wife happy when traveling. She no longer has to look at maps, and I no longer have to miss exits while she figures out which side of the map is up
Beware. When using GPS and laptops, make sure you have the latest version of software. Roads change and exits move. More then once I have ended up on the wrong road or missed an exit using old data. We will see how the new Delorme 2003 works this year, but I here its there best version yet.
Originally posted by waterdonkey
Any recommendations on brand and features. I have been thinking about getting one lately and do not know anything about them. One big question I have is..... do you have to subscribe to a service (monthly fee) for the thing to work?