Any GPS software that doen't use a data connection?

[oakwestplayer]

Well the title says it all. I travel out of the country often and I'm headed to Thailand next week. I sure would like to use my vogue for GPS but without a data conection due to the roam rates. I see people liking I-Go and a few others, but i guess i would have to get a Thailand map for it to work. Well any info would greatly be appreciated from this n00b. TIA