Goedemorgen,
I`ve tried pocketfms for a year. I was not happy with it because:
-The hardware keeps crashing and when it does run the battery dies quickly.
-The program is not very user-friendly IMHO
The only thing I did like, was the PC-planner. I didn`t renew my subscription. In any case, I think you would be best off with a dedicated aviation GPS. Preferably hooked to the onboard battery.
And don`t forget to use it as a back-up! Especially since you are low-time. Remember, the real wordld is out there and your GPS might crash any minute.