Texdoc,
I use PocketFMS for an fms program. It is freeware and VERY good. They supply maps which cover most of the world. Select the FIR's you want and download (still for free!). You can send a donation if you like and you then get access to better resolution maps. Well worth a look. (PS I am not in any way connected with this program, I just think it's very good!!).
The program will also do you C of G and some flight planning as well. For full use yon meed a GPS to plug into it, but you've mentioned moving map so perhaps you have that already??
google search for pocketfms should point you in the right direction!!