The map is already made up of tiles.
The problem isn't copying tiles to the left and right of the map when needed, that is easy.
The problem is that the map software is made for land navigation and has all sorts of clipping to stay within the limits of -180 and 180 degrees.
That means that markers and routes are limited to that area and will not be shown on the copied tiles outside that area.
I already had to change to software to show routes correctly.
The original would show a route crossing the 180 degrees meridian as a route crossing the 0 meridian, i.e. one large line crossing the whole world.
An other problem is that the map software is complex and undocumented and thus hard to fathom.
The continuous map is also discussed on the developers forum and in 4 years time no one has come up with a viable solution.
So, please give me at least another week to find a solution or work-around.