Thread: Convert garmin .img pseudo-NT to non-NT? I know it's possible, but how?(SOLVED!!!)

Originally Posted by testlelelala

I think i got it!!!
It seems to be that what is changed are the offsets of each internal section of each sub-file.
Which are changed simply because the header is displaced from the rest of the sub-file.
working...

PS: Now i need to learn how to interpret and change the offsets, which is probably very basic, but i don't have a clue

As you have found out, the difference between two, say TRE, headers are the contained offset values pointing to data sections in the TRE data area. In a NT or pseudo-NT GMP subfile the offset is always relative to the start of GMP header. But in a non-NT TRE/RGN/LBL subfile, the offset is relative to the start of TRE/RGN/LBL header respectively. So, for example, after you join a TRE header with its TRE data area (both from a pseudo-NT file), you need to update those offsets in TRE header to be relative to the start of the TRE header.

The location of an offset within a non-NT subfile header can be found in the document below.
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