planning trip from SC to PA

I have the Treo 650 and just purchased the PalmOne version (kit) with Tom Tom. I loaded the maps (Southeast and New England/Mid-Atlantic) I can't seem to plan a trip becuase of having to load one map at a time. I have plenty of room on my SD card. Can you merge maps? Or do I have any options.

Thanks in advance

[Stevie]

You should install the GB map so it covers all of the country.

The GB map won't cover the region he's interested in!

You need to load the Major Routes of America map and use that switching to the New England map when you are near your destination for more detail.