I see. thanks for the info.

Is there a page on splitting img's to mapsource? I've done it a few times, and it works most of the time, but i've also read posts here where it suggests you lose searching and/or other things. I guess I'm looking for a page that gives the details on the pitfalls of going backwards to MS from an img file. Obviously, what i'm thinking now is using this complete topo image and removing some areas to get the size down, but i don't know what functionality I'll lose in the process.