Ok, I investigated the issue
Flashed to SG/MAL FW 2.50: The MRT doesn't show up, no matter how close I zoom in
Flashed to EU FW 4.00: MRT symbols show up below 80m. But also in this case they are not visible in the "Where to" selection.
Needless to say that TW FW 3.20 also no MRT symbols show up.
@Turbo
Above you wrote it will look for "My Places.bmp". Not necessary anymore to name it "My Places1.bmp" and "My Places2.bmp"?
I am not sure which symbols were used, cause i had the in the folder MRT the file MRT.bmp, MRT1.bmp and MRT2.bmp