Thread: gmapprom issue

Looking into the details in the map tiles for "US Inland Detail Map with Imagery" gives that there's just a lot of imagery/bitmap data. Not very well suited for MapSource.

File: J:/Garmin/gmapprom.img, length 1692663808
Header: 24.01.2008 05:05:14, DSKIMG, xor 00h, Ms 0
Mapset: US Inland Detail Map with Imagery (3.00)
fat: 1000h - 1200h - 30000h, block 32768
maps: 256, sub-files 260

Sub-file fat length
00207615 GMP 1200h 21677243
GMP: TRE RGN LBL DEM
map 7757d0 (7821264)
date 23.01.2008 18:43:46
priority 28, parameters 0 6 31 65
levels [17,18,19,20,21,22,24], zoom [86,5,4,3,2,1,0]
N: 34.000025, S: 31.999998, W: -96.000037, E: -93.999968
Inland Detail Map
Copyright 1995-2008 by GARMIN Corporation.
CP 1252, American
Bitmaps 204, size 14089986 (4)
DEM layers: 2, N: 34.000117, W: -96.000119
...
...

It's possible to create a preview map for MapSource but it should have special more targeted settings for N/S & E/W. But that is anyway rather meaningless since there will not be any detailed maps when you zoom in.

The reverse engineering of gmap****.img to MapSource is more or less obsolete now when BaseCamp can read *.img files directly from removable media. Putting the "gmapprom.img" for "US Inland Detail Map with Imagery" on a USB stick in the Garmin folder works rather fine. At some zoom levels there's a mixture of picture data and map vector data.

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