Thread: Why is 'Suppmap1' in Nuvi 1xxx Inventory? & Why are some maps unselectable named as 'gmapoem'?

I thought the limits put on the map size ( Especially for units like the Montana 650 ) was based on how many "Tiles" were in am image and not the actual size of the image file.

I can't recall exactly what the tile limit was, but it was somewhere around 2025 tiles I thought for official Garmin maps.

For "custom" maps, the tile limit on the Montana used to be 100, but has recently been increased to a 500 tile limit for "Custom" maps on the Montana.

It will also depend on whihc GPS unit you are using and which Firmware/Software version.

If That Topo Norway Advenbture has more than the allowed number of tiles than the GPS will not work.

If there are 20 Map "Families", there well may be over the allowed number of tiles... I don't know.

There may be a way to movfe some of the tiles into another map image file and turn both the img files on using the Montana and they "may" both show up as one "may" overlay the other.

BTW.... I'm not an expert. Like many here... I'm still learning.

@timp4411

Some of the previous models have a limit of 2025 map tiles. The Garmin Oregon and Montana can handle at least 4000 map tiles.
Sorry if I didn't gave the full background but there's at least what I wrote in post #2:

Originally Posted by Ballebar

About the 4 GiB barrier!

Well, you can put as many <= 4 GiB map files as you want in the Map directory of your memory card. As long as there's room for all the files anyway.
The problem is other constraints like how many map tiles your unit supports and the most severe constraint about the number of map families it can support.
If I store all TOPO Norway Adventure in one gmapsupp.img then I have 20 map families there. That's NOT readable by any Garmin unit I've tested including the Garmin Montana 650t. Normally it works with 16 or 17 MapIDs as the total for all maps but not with 20.

All the problems with map families have been discussed in some other forums by other users. There's special patched variants of TOPO Norway Adventure with one single MapID for all 20 regions. I believe that Mapperoni is the creator of one such release.

The full installation of TOPO Norway Adventure have 727 map tiles and it would generate a file size of 1.24 GB according to MapSource. So it's well under 4000 or 2025 map tiles and also lower than 4 GiB and even less than 2 GiB.

Hi Ballebar,

Sorry for not reading the post from the beginning as you had already discussed the tile limitations.

Obviously, tile limitations are not the problem this time.

Have a great day !

Regards.