I have the Nissan Navigation, it's actually pretty good (in 2009) but now in 2017 I just use Google Maps on my phone and use BT for the voice. Works very well....
Updates for the 2009 Navi to about 2012 are available but it's still not 2017 worthy, if you know what I mean.
We have a 2016 Santa Fe with Navi and we still use phone for Navi in that car.
To answer your original question I have no knowledge/use of the Boss unit although I know it's a lower tier product. The Jensen mentioned is a mid tier product and it's a good head unit. Upper tier head units are no better as far as Navi.
None of them compare to the phone.
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