Hello,
I just though I would post this if it is useful for improving the index.
Generating the index for maps of several US states I got the following warning message:
WARNING: string pointer size is not 3, index will probably not work try with fewer maps until this is resolved.
Despite this, the map and index work fine in MapSource, I was able to transfer them to my eTrex Vista and did not find any issue using them in the GPS so far.
Thanks,
N.