Hi, I believe you will need to address two issues if its anything like the embedded software I have been involved with in the past.

1. If the gif is a different size than the original you will probably get errors as the linked image probably requires different modules all at previously assigned places - set at image link time. I think you would need to make the image identical size to get around this with the same byte alignment also.

2. There is no doubt a checksum across the whole image to ensure the Nav hardware doesn't start running corrupt s/w and therefore die in a nasty way. This I dont think you can get around other than to work out how the checksum is done. Presumably on the other thread where some mods were done this has been solved (?)

Good luck !

cheers,
Seedar.