Loading 5.3 on the garmin after editing the priority to 25 shows only one map!
Here is the log from Gmaptool for 5.3...I dont detect any obvious difference.
Rather interesting...the only thing I havent tried is loading the unedited 5.3..So all is well apparently with 5.3, but 5.2 does show up as two maps with one having much more detail. Any thoughts?
Thx for the comments!
Header: 06.02.2010 19:27:24, DSKIMG, xor 00h
Mapset: Mexico gpsatlas v5.3 unlocked

Map length s-f CP prio PID FID name
I000071C IDX 22479527 2
I1FC9351 MPC 939566 5 1252 25 34 1820 OCCIDENTAL 8
I1FC9352 MPC 2625460 5 1252 25 34 1820 ITSMO 4
I1FC9353 MPC 2216332 5 1252 25 34 1820 ITSMO 5
I1FC9354 MPC 2931222 5 1252 25 34 1820 ITSMO 6
I1FC9355 MPC 3076213 5 1252 25 34 1820 ITSMO 7
I1FC9356 MPC 3371799 5 1252 25 34 1820 RIVIERA MAYA 6
I1FC9357 MPC 5573302 5 1252 25 34 1820 MEXICO CENTRAL 1
I1FC9358 MPC 2114146 5 1252 25 34 1820 OCCIDENTAL 6
I1FC9359 MPC 19949253 5 1252 25 34 1820 MEXICO CENTRAL 2
I1FC935A MPC 6056327 5 1252 25 34 1820 MEXICO CENTRAL 6
I1FC935B MPC 2368145 5 1252 25 34 1820 ITSMO 2
I1FC935C MPC 1297609 5 1252 25 34 1820 ITSMO 3
I1FC935D MPC 4226750 5 1252 25 34 1820 RIVIERA MAYA 3
I1FC935E MPC 2877114 5 1252 25 34 1820 RIVIERA MAYA 4
I1FC935F MPC 132656 5 1252 25 34 1820 RIVIERA MAYA 5
I1FC9360 MPC 2565529 5 1252 25 34 1820 OCCIDENTAL 5
I1FC9361 MPC 4951210 5 1252 25 34 1820 OCCIDENTAL 7
I1FC9362 MPC 4977882 5 1252 25 34 1820 OCCIDENTAL 3
I1FC9363 MPC 8865166 5 1252 25 34 1820 N ESTE 12
I1FC9364 MPC 4784915 5 1252 25 34 1820 N ESTE 11
I1FC9365 MPC 423162 5 1252 25 34 1820 RIVIERA MAYA 1
I1FC9366 MPC 4773632 5 1252 25 34 1820 RIVIERA MAYA 2
I1FC9367 MPC 9255299 5 1252 25 34 1820 N ESTE 4
I1FC9368 MPC 2867429 5 1252 25 34 1820 N ESTE 5
I1FC9369 MPC 3737283 5 1252 25 34 1820 N ESTE 2
I1FC936A MPC 4954791 5 1252 25 34 1820 N ESTE 3
I1FC936B MPC 6326617 5 1252 25 34 1820 N ESTE 1
I1FC936C MPC 3248424 5 1252 25 34 1820 OCCIDENTAL 1
I1FC936D MPC 5011107 5 1252 25 34 1820 OCCIDENTAL 2
I1FC936E MPC 1853364 5 1252 25 34 1820 BAJA EXP 7
I1FC936F MPC 1753775 5 1252 25 34 1820 B COBRE 10
I1FC9370 MPC 4873056 5 1252 25 34 1820 B COBRE 11
I1FC9371 MPC 3024869 5 1252 25 34 1820 N ESTE 10
I1FC9372 MPC 2431770 5 1252 25 34 1820 BAJA EXP 6
I1FC9373 MPC 2683320 5 1252 25 34 1820 B COBRE 6
I1FC9374 MPC 4090342 5 1252 25 34 1820 B COBRE 7
I1FC9375 MPC 3676004 5 1252 25 34 1820 B COBRE 8
I1FC9376 MPC 3350967 5 1252 25 34 1820 N ESTE 9
I1FC9377 MPC 501937 5 1252 25 34 1820 BAJA EXP 3
I1FC9378 MPC 2531252 5 1252 25 34 1820 BAJA EXP 4
I1FC9379 MPC 3854376 5 1252 25 34 1820 B COBRE 16
I1FC937A MPC 4179061 5 1252 25 34 1820 B COBRE 3
I1FC937B MPC 3140969 5 1252 25 34 1820 B COBRE 4
I1FC937C MPC 2979640 5 1252 25 34 1820 B COBRE 5
I1FC937D MPC 2733996 5 1252 25 34 1820 N ESTE 8
I1FC937E MPC 6094902 5 1252 25 34 1820 BAJA EXP 1
I1FC937F MPC 1878669 5 1252 25 34 1820 B COBRE 15
I1FC9380 MPC 2210120 5 1252 25 34 1820 B COBRE 1
I1FC9381 MPC 2940711 5 1252 25 34 1820 B COBRE 2
I1FC9382 MPC 1401489 5 1252 25 34 1820 MEXICO CENTRAL 3
I1FC9383 MPC 2391485 5 1252 25 34 1820 MEXICO CENTRAL 4
I1FC9384 MPC 2902400 5 1252 25 34 1820 MEXICO CENTRAL 5
I1FC9385 MPC 4849542 5 1252 25 34 1820 BAJA EXP 5
I1FC9386 MPC 3348834 5 1252 25 34 1820 B COBRE 12
I1FC9387 MPC 6121721 5 1252 25 34 1820 B COBRE 13
I1FC9388 MPC 2811334 5 1252 25 34 1820 B COBRE 14
I1FC9389 MPC 3549963 5 1252 25 34 1820 B COBRE 9
I1FC938A MPC 13772491 5 1252 25 34 1820 MEXICO CENTRAL 8
I1FC938B MPC 5906370 5 1252 25 34 1820 MEXICO CENTRAL 9
I1FC938C MPC 2892981 5 1252 25 34 1820 ITSMO 8
I1FC938D MPC 3770376 5 1252 25 34 1820 ITSMO 9
I1FC938E MPC 3775453 5 1252 25 34 1820 ITSMO 10
I1FC938F MPC 5405035 5 1252 25 34 1820 ITSMO 1
I1FC9390 MPC 4079753 5 1252 25 34 1820 MEXICO CENTRAL 7
I1FC9391 MPC 2308927 5 1252 25 34 1820 OCCIDENTAL 4
I1FC9392 MPC 6934682 5 1252 25 34 1820 OCCIDENTAL 9
I1FC9393 MPC 1680327 5 1252 25 34 1820 N ESTE 6
I1FC9394 MPC 7946480 5 1252 25 34 1820 N ESTE 7
I1FC9395 MPC 343447 5 1252 25 34 1820 BAJA EXP 2
I1FC9396 MPC 56794 5 1252 25 34 1820 B COBRE 17
I1FC9397 MPC 165745 4 1252 25 34 1820 NUM R MAYA 1
I1FC9398 MPC 35231 4 1252 25 34 1820 NUM R MAYA 2
I1FC9399 MPC 59447 4 1252 25 34 1820 NUM B COBRE 1
I1FC939A MPC 19064 4 1252 25 34 1820 NUM B COBRE 2
I1FC939B MPC 294187 4 1252 25 34 1820 NUM OCCIDENTAL 1
I1FC939C MPC 6301775 4 1252 25 34 1820 NUM MEX CENTRAL 1
I1FC939D MPC 6462959 4 1252 25 34 1820 NUM OCCIDENTAL 2
I1FC939E MPC 6316565 4 1252 25 34 1820 NUM OCCIDENTAL 3
I1FC939F MPC 6487671 4 1252 25 34 1820 NUM OCCIDENTAL 4
I1FC93A0 MPC 6034713 4 1252 25 34 1820 NUM OCCIDENTAL 5
I1FC93A1 MPC 2588062 4 1252 25 34 1820 NUM NORESTE 1
I1FC93A2 MPC 2466338 4 1252 25 34 1820 NUM NORESTE 2
I1FC93A3 MPC 1200543 4 1252 25 34 1820 NUM MEX CENTRAL 2
I1FC93A4 MPC 1793340 4 1252 25 34 1820 NUM MEX CENTRAL 3
I1FC93A5 MPC 1712666 4 1252 25 34 1820 NUM MEX CENTRAL 4
I1FC93A6 MPC 1114695 4 1252 25 34 1820 NUM NORESTE 3
I1FC93A7 MPC 6282722 4 1252 25 34 1820 NUM R MAYA 3
I1FC93A8 MPC 4711857 4 1252 25 34 1820 NUM B COBRE 3
I1FC93A9 MPC 5361217 4 1252 25 34 1820 NUM MEX CTRAL 5
I1FC93AA MPC 1334227 4 1252 25 34 1820 NUM MEX CTRAL 6
install ? 973 1
mapset00 ? 1106 1
mapset00 ? 16212 1
mapset00 ? 12295 1
uninstal ? 466 1
MAPSOURC MPS 8292 1

Data MPS
V: Mexico gpsatlas v5.3 unlocked (0)
U: 25A33-D2NMF-NDS92-WQWKT-V2KP4