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Many free apps are available for moving-map topos on Apple and Android MartPhones. Here are few that will allow Topo maps to be downloaded (from AppStore/MarketPlace) for offline use with movnig-map GPS.
    - GAIA GPS for Apple and Android. Offline myTopo/MapTech topos. Paid version imports GPX files. Custom maps can be created.
    - PDF Maps from Avenza on iPhone/iPads will load the standard PDF files from Incident Command GIS teams and provide GPS moving map. Goto the NIFC site, find your fire and drill into find the standard PDF published every morning. Click it to start loading the PDF, but right go to the address bar of the browser and copy the URL address. Kill the browser, and go to Avenza PDF Maps. Click the + to add a map, and paste this URL. The Geo PDF loads and allows live moving map using the internal GPS. 

Download these from Apple AppsStore or Android Market Place. There are others, look around. It is usually worth paying a little extra beyond free to get advanced features. No one yet provides symbolized GIS overlays.