As I said in the Undertroll chat, this tutorial is great except that it could be worded a lot better to make things simpler.
This is my plain-language translation of this tutorial:
The world map is divided into 12 segments, each 256 x 256 px except the last 4 which are 256 x 176
Therefore, the entire image is 1024 x 688 px
The following addresses are the addresses of each segment, from left to right, and top to bottom:
574A10
57CA10
584A10
58CA10
594A10
59CA10
5A4A10
5ACA10
5B4A10
5BA210
5BFA10
5C5210
The default world map uses 60 colours by using 4 palettes; however, things are much simpler for you if you use 15 colours (+1 transparent colour) so don’t worry about the “TSA”. If you are indeed using the same palette for this, then I would recommend simply copying and pasting the same palette for each one so that there are four of the same palette. If you don’t know how the change the palette of the image, then I would recommend reading one of these fantastic tutorials to learn. [TUTORIAL CURRENTLY UNAVAILABLE ON FEU2 @CT075 please post it at some point]
To ensure that your palette is the same for each image segment, I would personally recommend copying just the one BIG image and making 12 copies out of it, and then cropping each one individually in Usenti (ensures that the palette is always in the same order)
The pointers (what’s a pointer?) for each image are at 0xCE7818 and there are 12. After that there are another 12 pointers for the “TSA” (once again, unimportant). Once you’ve inserted your pieces of the world map you can head over to that address and write them in. Once again, they are ordered from left to right, top to bottom.
Edit: I posted this topic on what might potentially happen to the palette, and @Jubby very graciously posted an easy fix for it. Thanks Jubby!