It works at our device S4 mini.
The configure the whereyougooffline maps is very easy: only one klick.
We use these vector maps:
http://download.mapsforge.org/maps/europe/
Infos here:
https://code.google.com/p/mapsforge/
But I think there ist Bug in the Where/You/IGo Ap: You can not interrupt the search, although there is a massage, that the game was saved.
If you want to start new at the saved position the device has a crach.