GPS with Offline Maps to work without any Data Plan

Friends

I'm very impressed with this Forum and I've decided to get Samsung Impression without any Data Plan

Suggest which GPS with Offline Maps [DFW] to work without any Data Plan

I notice that there are many GPS Software in Java available, which leads to confusion as I read that phones go freeze once Offline Maps size is beyond 100 MB, which is scary

Thank you so much and I'd like to share my friend's experience on installing MGMaps. He installed MGMaps along with Texas Hybrid Map from Microsoft and the total file size is about 480 MB. The phone freezes for an hour and rebound and showed the triangulation with a map but it doesn't search or so

Then I asked him to WeTravel RC31 and it works quick but it doesn't show the map at the background although he pointed at mmc\WeTravel\Map folder

To my knowledge, he didn't change any LBS Settings and my guess is to change the LBS Settings to make it navigate beyond positioning

I read a review in PhoneScoop and it stated that Impression is built with A-GPS and not Standalone GPS, but I believe it's true because LBS Settings were set to A-GPS so that AT&T Navigator can work

Interestingly I noted that Samsung Mythic and LG CF360 are configured with Standalone GPS and claim that they can work even without a SIM Card in it

Please share your thoughts as it'll help us understand the concepts and learn what Impression can do so that we can install the workable Apps rather than blaming the device