You can not get standalone gps(gps without data plan) with a stock version rom. You must follow the steps in the below link exactly. You rollback to erase verizon gps lock to pregps rom then upgrade to you choice of custom rom. You don't have to use the dcd rom suggest use which ever you choose.
http://forum.ppcgeeks.com/showpost.p...94&postcount=4
There are many gps mapping software. I use garmin xt with north america maps on a 2gb card. Also try navizon from the link in my signature to signup and log data and get paid to use your gps. Pm me if you have any questions I can answer.