Originally posted by Syd118TSI
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1) dead reckoning, i.e. navigating in tunnels - super handy to have and my previous car (bmw with business nav) had this. that said, it regains gps lock within a second of coming out of a tunnel, if you know the brief moment of sunshine between the harbour tunnel and the ED, that's more than enough to relock

2) startup time - as above, gps lock is fast... however it takes almost a minute for the thing to boot up and be ready to use in the nav software.
3) no integration with vehicle speed for speed-sensitive volume
my requirements were that it performed the basic functions satisfactorily and looked good most of the time, and for me personally paying almost twice as much for a nicer interface that i'll rarely see/use wasn't justifiable. however, the above 3 points are just starting to rear their ugly heads so there is merit in retrofitting an rns510 - but only if it's near/under $1000.
a question about rns510 retrofit - does it come with a puck-style gps antenna, and if so, where do you install it? what about compass?
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