Thread: Basemap Replacement in Regional Devices without Mass Storage Mode Access.

Thanks for the info Kanopus. That has big implication for some non-EN speakers using an American unit in Europe of course, but it's also relevant if someone wishes to use their Atlantic model with Americas or Pacific Basemap elsewhere and maybe loses their preferred Language support.

In the later case, could some adjustment be made to a 'non-Atlantic' basemap to fool the unit it's reading an Atlantic version? I mean by changing the map's header info or even just it's product number in GMAPTool's Join tab?


I stupidly forgot to mention in the initial post about using kunix's handy tool makergn.exe to automate creation of the rgn file with the correct region number inserted in hex.

So to eliminate having to use RGN_Tool and a hex editor, put makegn.exe and gmapbmap.bin in the same directory then make a BAT file with this text: "makergn.exe gmapbmap.rgn 3 gmapbmap.bin" but without the quotes, drop it in with the other two files, run it and gmapbmap.rgn will be created with 03 correctly inserted at offset 0x32. The input and output file names are immaterial and could be 'out.rgn' and 'in.bin' or any other convenient names. I simply find it easy to use the conventional basemap file naming consistent with the initial gmapbmap.img file name.

I couldn't find a download link in the forum index or a dedicated thread for makergn.exe [but didn't look hard] so here's its SourceForge dl link:

Code:

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Also, RGN files can be made for primary and oem detail maps using region 49 & 50 respectively. Even a logo.rgn can be flashed by this method to region 16 [10 in hex]. I accidentally flashed a map to my SPc320's region 16 (yep, intended to flash it to the SD card [rgn10/0A] and overwrote 16 [hex 10] instead so lost the logo). I replaced it by modifying a nuvi3x0 logo with a custom image and flashed that. Seems to work fine:

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Sorry for OTs, but does anyone know in which region supplementary detail map gmapsupp.img is stored on capable units? Logically seeing primary map is rgn49 and oem map is rgn50 it could be rgn51 but without a usb dumper to copy regions even i'm not brave [read stupid] enough to try it. EDIT: For onboard storage of the supplementary map it's still region 10 [hex 0A] in those units which support OB detail maps. Tested with SP2720.