Nissan SatNav is the most useless piece of junk there is.
I took mine out and was going to replace it with a tablet.
The best fit I could find was a NVIDIA Shield K1 8 Inch Tablet (cheap).
https://www.nvidia.com/en-us/shield/tablet/
Would need to build a frame for it, but size of 8.8in by 5in was perfect to fit inside the hole left when the Nissan satnav was removed (7 3/8in by 4 3/8in) as that was the display size.
But the draw backs were a problem, mainly charging and blue-toothing a GPS to it.
Plenty of nav software for android lollipop.
I found no actual sat nav unit that would fit.
I did not want to put a sat nav in the double DIN as you have to look down at the small screen at it all the time (been there, done that and eye sight aint what it used to be).
And besides, that would still leave you a rather large and useless hole in the dash.
Besides, I threw out the useless Nissan 6 stacker CD and radio and replaced to with an good alpine double DIN with steering control adaptor (along with the nissan speakers). Incredible sound difference.
So, what I am doing is mounting a Samsung Galaxy 10.1 Tab with blue-tooth and internal GPS (already have street mapping).
The hole will be filled with a plastic block, shaped to the opening and fitting the old sat nav mounting screw holes with a hole drilled through the centre to accept a gimbaled flat screw RAM mount that will be attached to the metal frame that is deeper in the old sat nav location and run out through the hole in the plastic block.
The bottom (short edge) of the tablet fits neatly into the little pen holder thingy that is just in front of the sat nav. A bit of foam rubber padding will be glued to the bottom of it as a shock absorbed. The pen tray allows enough movement to angle the tablet towards the driver.
The Galaxy tab has the GPS sensor on the upper (short) edge and I have been able to pick up GPS satellites easy when I tested the location. Also noted where the upper edge was when sitting in the drivers position and you can see the top of the front bar over it, so will not be a bit of cop bait as it does not obstruct the driver view.
All I need to do then is to hard wire the charging lead in to the Patrols electrics via a 2A USB outlet and the correct charging cord (this is not a normal USB cord as the tablet needs to know it is a dedicated charger to draw full power).
End result will be a nice large easy to see nav screen that will be able to get up dates and new hema maps as long as you are close to a free WiFi.
Already measured and sourced all the parts, just waiting to get my Patrol back from Shaun (Gassed GU) who is dropping a duramax into it.
Once I do I will be doing a full write up on the fitting.