Hello Everyone!
I have a quick question on my gpsmap620: basically I am trying to upload on its sd card two Bluechart maps. Both maps unlocked, uploaded individually and renamed as gmapsupp.img work but if I try to merge them with Gmaptool I get a 4.099.000 bytes (3,81 Gb) .img file and, when I copy it on the sd file, my garmin will only recognise one of the two maps (randomly). I tried to rebuild the merged file and again only one map will be recognised by the gps.
If I upload the two maps with their original file name (VU013someting.img), it won't recognise them.
Not that this is a big deal, both maps are far away from each other and I can easily rename the one I need each time, I was just looking for a way to get them both working on the sd and forget about it.
My question is....shouldn't the gpsmap 620 recognise multiple maps without renaming it gmapsupp.img? I used it "straight out of the box" without updating it through garmin express (should I anyway?). Am I doing something wrong while merging the two maps? I have followed your tutorial and seems pretty straightforward...
Thank you!!

M.