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Creating IMG map with only some tiles of another IMG map

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Sorry if it comes out duplicated.

Hi All

I am trying to produce an IMG (I will call small.IMG) from a garmin map in IMG format (such as Garmin-MENA-2021-10-fid-8431-a-4 = big.IMG) retaining just some tiles of it (for the example, just Egypt). Let us assume that a gmap version of the map is NOT available, so answers stating get a gmap of the map is not the solution!

While I am happy to hear about other alternatives if there are, to generate the small.IMG I wish to use Basecamp, as with it I can produce a good IMG selecting the tiles that I am interested in using a graphic way (maps / install maps, then select device and then select the wished tiles). That to work requieres having the map installed in Basecamp. And yes, I "install" it to a virtual device, and with javava device manager I make it visible again in Basecamp etc.

Way A
Creating a gmap from an IMG - this would be the most strait forward way but I did not find any tool for that (and I know this way works because I started with some gmap downloaded and it works). So, once a gmap folder is available for bigmap.IMG, just putting it under ProgramData/Garmin/Maps would be installed in Basecamp and I would be able to install it in the device etc.
I tried to do this using Maptk. For some maps it works. For some other, it fails (not able to handle big size maps or any other issue, not sure....). Tried to solve the issues with the developer to no avail.
So, question A: is there a way/tool that is able to create gmaps from IMGs flawlessly? If yes, how/which tool?

Way B
Create an installable set using a reg file - this is the less direct way, and I made it partially work, so ....
I tried to achieve this using Gmaptool + mkgmap, using the split functionality. If big.IMG is not too big, it creates a set instalable via reg, but has some pitfalls. If it is too big, it fails. I discovered this trying to get Ireland.IMG from a Europe.IMG from OSM / Computerteddy. Luckily, Computerteddy has sections of Europe - unfortunatelly Ireland was in two different sections. So, I took Big-Section1.IMG and produced set1 (using gmaptool+mkgmap), installed it using the reg, and created smallsection1.IMG Then did same to Big-Section2.IMG. Then joined smallsection1.IMG and smallsection2.IMG ....
Anyhow, using this route, the pitfall is that the output of gmaptool+mkgmap has the upper zoom levels empty, no cue of geography, just the blank rectanbles of the tiles, and one has to zoom so much to see information on the map that it becomes to detailed to select the tiles. It becomes error prone so you put too many or not enough in the selection. I do not know why basecamp is not showing the base map when that my IMG is loaded. I wonder if the solution is making something transparent or what....
So, question B1: is there a way/tool that is able to create flawlessly such reg registry sets? (so that size is not an issue?)
And, question B2: how can I make so that the base map is shown when I have empty zoom levels or how to avoid having empty zoom levels or how to add base map to the IMG so to avoid the lack of positional cues at the upper zoom levels?

As resume:
Starting with Big.IMG, whish to produce Small.IMG (just some tiles of big.IMG). Wish not to lose routing information, etc.
a) Get to install Big.IMG in Basecamp so that can be installed in device
b) Way A: Big.IMG -> gmap / How? (no Maptk!)
c) Way B: Big.IMG -> set "reg installable" + avoiding empty zoom levels. How?

Some images to try to explain easier:

What one sees when installing maps from Basecamp when basecamp is using a gmap map:

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What one sees when installing maps from Basecamp when basecamp is using a reg registered set created with Gmaptool+mkgmap

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What one sees in Basecamp using a reg registered set created with Gmaptool+mkgmap with zoom far (in this case, 70kms)

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Next zoom level - 50 kms
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TIA
caspertone2003 Reviewed by caspertone2003 on . Creating IMG map with only some tiles of another IMG map Sorry, I tried to post this question but cannot see it in any place, so try again... Sorry if it comes out duplicated. Hi All I am trying to produce an IMG (I will call small.IMG) from a garmin map in IMG format (such as Garmin-MENA-2021-10-fid-8431-a-4 = big.IMG) retaining just some tiles of it (for the example, just Egypt). Let us assume that a gmap version of the map is NOT available, so answers stating get a gmap of the map is not the solution! While I am happy to hear about other Rating: 5