Ok, with the little help of Bluestacks (which can emulate many Apps on the PC/Mac) and Wireshark, I discovered the appropriate mapsources for MTB CR and OpenTrackMap (for use in MOBAC):
MTB CR
<?xml version="1.0" encoding="UTF-8"?>
<customMapSource>
<name>Custom MTB CR</name>
<minZoom>0</minZoom>
<maxZoom>18</maxZoom>
<tileType>png</tileType>
<tileUpdate>None</tileUpdate>
<url>http://tchor.fi.muni.cz:8080/mtbmap_tiles/{$z}/{$x}/{$y}.png</url>
<backgroundColor>#000000</backgroundColor>
</customMapSource>
OpenTrackMap
<?xml version="1.0" encoding="UTF-8"?>
<customMapSource>
<name>Custom OpenTrackMap</name>
<minZoom>0</minZoom>
<maxZoom>16</maxZoom>
<tileType>png</tileType>
<tileUpdate>None</tileUpdate>
<url>http://opentrackmap.cz/static/{$z}/{$x}/{$y}.png</url>
<backgroundColor>#000000</backgroundColor>
</customMapSource>
Curiously I sniffed into SHOCart as well and here it is only with a kind of code, e.g.:
services.tmapserver.cz/stiles/gm/shc/13/4400/2757.png?m=l&t=1356887023&k=W2FShwuHre0ipLBDM1NMpw
which gives an 403 (forbidden) if it is not the right one.
This is totally clear, because these maps are for pay download only.
But to have a complete set of maps, I downloaded the SHOcard hiking+relief map for my region online with locus (just by moving the map through the Böhmen region in each zoom level I need).
After this I copied the sqlite-map from
/Locus/mapsOnline/SHOCart_Hiking+relief.sqlitedb
to
/Locus/maps/SHOCart_Hiking+relief.sqlitedb
so I hope it wont be unusable after seven days (which is a bit too simple, though).
I hope all this is not illegal, as I use it totally for my own and private purpose.
frank