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There is no best as none of these programs are perfect. Depending on your preferences, one may be better than another. Example 1, many people complain about the 3D map in OnCourse Navigator version 5 not displaying street names. I do not use the 3D display and think the space used to program it is totally wasted, so that is not a big deal to me. Example 2, I prefer OCN5, because nobody comes close to matching their map compression. I want to load the USA and Canada maps and never have to mess with it again. The USA plus Canada Seamless map only takes slightly more than 1GB of space. Other programs take 2 GB or more for the same maps.
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