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Some GPS navigation apps for smartphones are better than others and are worth the onetime lifetime fee. Take For Example, CoPilot Live, reputed to be one of the best. Sure, there are free apps, but with CoPilot Live, the maps are stored on-board the phone so you don’t rack up roaming charges or worry about being left stranded without navigation in a mobile dead zone as with the free versions that require you to download maps via your mobile internet each trip. For more information about the difference between what the industry calls on-board navigation—what CoPilot Live has—and off-board navigation, what you get with most free versions