I have tried this for the first time, and it worked.

I installed GPSJinni and Mapper.

My first trial is GPSJinni (Satellites), then after a few minutes, I started Mapper (GPS tab). It suddenly gets a GPS fix when I noticed GPSJinni's satellite bars turned GREEN which took 5-7mins.

I opened Ovi Maps, cancelled network connection prompts, then voila! I can see my location on the map with a RED dot.

*I just worry about Mapper as it sometimes crashes at random startup.
*I haven't tested yet if it was GPSJinni which really caused the GPS fix, or if it's Mapper.