I don't know if I'm the only one that still notices this or still has this problem, but I recently decided to look into fixing it, as AE has it somewhere on their "todo list", and I'd rather not keep the map markers I have for Sslanis on the Istaria map any longer (especially with the number of map markers I already have growing each day). The map seemed to work, but thereis an offset issue.

So, I went in and looked up the location of the Sslanis pad on the map, and the location of the pad in reality.

Map location: 19173/21588
Real location: 19773/21699

I personally got the difference to be about 600 coordinates to the west, and about 111 south.

So to fix this, we have to edit two files...

\Horizons\Resources\interfaces\maps\Sslanis\map.de f
and
\Horizons\Resources\interfaces\maps\Sslanis\map_ss lanis_terrain.def

In map.def...
Find...
float WorldGlobalLeft = 19133.24
float WorldGlobalTop = 21642.33
float WorldGlobalRight = 19353.24
float WorldGlobalBottom = 21422.33
Change to...
float WorldGlobalLeft = 19733.24
float WorldGlobalTop = 21753.33
float WorldGlobalRight = 19953.24
float WorldGlobalBottom = 21533.33

That sets the area of the window when you click, "Sslanis" in the drop-down box.

In map_sslanis_terrain.def...
There's a lot to edit, here.

UI_MAPSECTION
{
float WorldLeft = 19133.24
float WorldTop = 21642.33
float WorldRight = 19243.24
float WorldBottom = 21532.33
string Image = "map_sslanis_01.png"
}
Becomes...
UI_MAPSECTION
{
float WorldLeft = 19733.24
float WorldTop = 21753.33
float WorldRight = 19843.24
float WorldBottom = 21643.33
string Image = "map_sslanis_01.png"
}

UI_MAPSECTION
{
float WorldLeft = 19243.24
float WorldTop = 21642.33
float WorldRight = 19353.24
float WorldBottom = 21532.33
string Image = "map_sslanis_02.png"
}
Becomes...
UI_MAPSECTION
{
float WorldLeft = 19843.24
float WorldTop = 21753.33
float WorldRight = 19953.24
float WorldBottom = 21643.33
string Image = "map_sslanis_02.png"
}

UI_MAPSECTION
{
float WorldLeft = 19133.24
float WorldTop = 21532.33
float WorldRight = 19243.24
float WorldBottom = 21422.33
string Image = "map_sslanis_03.png"
}
Becomes...
UI_MAPSECTION
{
float WorldLeft = 19733.24
float WorldTop = 21643.33
float WorldRight = 19843.24
float WorldBottom = 21533.33
string Image = "map_sslanis_03.png"
}

And lastly...
UI_MAPSECTION
{
float WorldLeft = 19243.24
float WorldTop = 21532.33
float WorldRight = 19353.24
float WorldBottom = 21422.33
string Image = "map_sslanis_04.png"
}
Becomes...
UI_MAPSECTION
{
float WorldLeft = 19843.24
float WorldTop = 21643.33
float WorldRight = 19953.24
float WorldBottom = 21533.33
string Image = "map_sslanis_04.png"
}

Those sections set up the images that make up the Sslanis map.

That should fix the issue. Takes about 5 minutes to figure out and do. You can even do it while you're playing the game in windowed mode. Use /loadui, but remember that all the chat that you've seen so far will be reset.

So anyway, now that this is fixed, AE will magically have a patch to fix it, right? ;)