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Originally Posted by Ninja
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Main memory will load fastest, but suck up storage space. SD will load slowest, and uses no Storage RAM, but you can lose the card. I'd go with the IFS if you want the program available always, and a good speed compromise.
Ninja
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The program is absolutely useless without the maps, so having it in internal memory doesn't really make it always available, even if you don't have a card installed. I could see this being more useful if you had several cards with different maps on them, but I don't do that much traveling that I would need to do that. I am using iGuidance and it has the option to just install the necessary information to get from point A to point B, for example. So you could enter the locations you were traveling to and the resulting maps would take up less space than installing every state you happened to pass through.
I do have the program installed into filestore though, just in case I do have to access maps on another card, but mostly because my space on my SD card is getting lower than filestore right now. If filestore memory started to become scarce, for example, after the WM 5 upgrade became available, I'd have no problem installing the program onto a SD card instead. I bet there's a way you could get the program copied to every card that had maps on it so it was always available when you needed it.