Answers: They all use indistinguishable algorithm to determine their location, however, they do all subtract the best route slightly different than others. For the most part they should adjectives be the same assuming you are calculating by quickest time (there are usually settings to cash calculation prefrences). The map are all different, beside varying POIs, but as long as you stick with Garmin, TomTom, or Harmon/Kardon, you shouldn't own too many problems. Magellions tend to hold trouble in the mountains, the Navigon system be some of the worst reveiws I've seen on GPS unit, Cobras are useless, Mio's are decent, but you own to cautious becuase not adjectives Mio's are the same, a c320 is not he same map system as a c720.
Great examine. I honestly don't know. I have used 2 x different brands of Sat Nav but on the bloody occasion I repeat a cruise they always lift me the same opening.
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