Hi Navmann,
Actually I see the same problem area now on my Oregon 600 (dark blue area) like your picture from post #9.
I analysed the gmapsupp.img from post #1. :
- there is no FID/PID written in the mapfile (JaVaWa Device Manager don't recognize the maps).
- I split the map for Mapsource with GMapTool, write a FID/PID and registered the map.
- Select the whole map in Mapsource and send to my Oregon to make a new gmapsupp.img
- Same problem: still the dark blue area.
- Further analyse in Mapsource by selecting/deselecting maptiles: there is one tile: "_v85_MSDGAR33SC_Prototype I0000055" that covers the blue area and also covers the smaller (normal) maptiles in that area. So there is no maptiles missed or locked, but there is an overlap in maptiles. Mapsource, Basecamp, Homeport: no problem, I don't see that dark blue area, just the correct maptiles. But on your gps-device that gives a problem (maptiles with same FID, same area

So far now, I proceed to analyze, experimenting.
(making a new gmapsupp.img without that xx55 maptile I guess, or making maptile xx55 transparant).