You'll only pay for net access, and whether or not you need to access the net depends on how you use MGMaps. If you just run it as is, then you'll need to access the net to download maps. You also use the net to search.
However it is possible to install your own maps, and if you only use the map functions, rather than the search tools, then you need never pay for data.
MGMaps shouldn't attempt to access the net unless you allow it to.
But is is entirely possible to incur data charges if you use it without restraint... I use mine for the occasional search, but I suspect that if I used it to load maps then the data charges could be high.
I assume you are talking about the GPS Info app in the Telstra phone when you mention the app in the extra menu -- this doesn't use maps, it just allows you to enter waypoints for guidance, or to track your route -- useful if you are heading off into the bush and need to find your way back:)
GPS Info has no need to use the net, and won't cost you anything.
MGmaps is free if you install "cached" maps and turn network usage off in the mgmaps settings, costs WAP charges of $10 per meg if you don't use the cached maps.
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