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I tried OCN5 but didn't like it much since there are no street names in 3D mode, among other things. I kept getting the Memory Allocation errors since I made the BIG mistake of getting the BIG seamless USA/Canada map with it. You need a MINIMUM of 20MB of free PROGRAM memory to avoid the errors when using the BIG seamless maps. Using this map makes map navigation ( ie. searching for points on the map ) VERY, VERY slow. It took well over a minute sometimes to zoom into a particular place if it was packed with POIs. I am using TT5 now and it is MUCH faster since it only uses regional or state maps, which is a drawback if you are traveling cross-country.
I had OCN5 installed on a 4GB A-Data SD card along with the 1GB US map.
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