Update. the all in one jaycar unit failed after a few months and was replaced with another which also promptly failed. The steel mate combo camera/ reverse sensor also failed, was replaced and that too failed straight away. I had a hell of a time getting a refund from Jaycar as they were only willing to replace it with another unit which was no good for me after having two of each product already fail.
The jaycar touchscreen has design faults and without any support (phone or online) or troubleshooting available from jaycar or the manufacturer, you are stuck on your own trying to sort it out if it stuffs up, each time paying for installation costs if you are paying to get it done (which you kind of should. If jaycar think that you installed it yourself they will not honour any warranty claims).
As for the steelmate camera/sensor combo, it failed each time because they will not work if installed surrounded by metal, instead of plastic as they were designed for. Jaycar are unaware of this and there is no mention of this on the steelmate website or packaging. I have found an alternate reverse sensor (not camera/sensor combo) that works in steel but cannot find it at the moment. Pm me if you want to know and I'll dig it up.
After my failed installation attempt I did MUCH more research on other single din touchscreen units. I came to the conclusion that there is a good chance that all these units will fail in time. The weak point on all these units is the motoriaed drawer mechanism. Unless kept well lubricated (which is not possible without pulling them apart) they gum up and overstrain the little motor which eventually burns out. I imagine this is only made worse if where dust and vibration is present ie not so good for a defender.
I then considered a manual pullout single din touch screen (no drawer mech to fail) which would connect to a carputer containing music, maps etc. By the time I added up the costs of the touch screen, carputer, bluetooth unit and installation, it was waaay cheaper to buy an ipad 2. Carputers also have to boot up and down which is a pain when you want to jump in and have it all going straight away.
The ipad 2 has a built in gps (with accelerometer making it more accurate and responsive than my touring 500s gps), bluetooth, wifi and works on the 3gs network. It has a better and bigger touch screen for navigation, makes phone calls, surfs the web, holds all my music, I can tune into pretty much any radio station on the planet, I can connect a bluetooth webcams to it for a reverse camera and I can remove it all at will when I want to lie in my hammock and watch a movie. I will use a ram mount with a swing away arm that will position the iPad in the centre of my dash. When I want to get to the dash buttons I just swing it out of the way and back again, simple.
If you have an iphone you can wirelessly (via the built in wifi) route its 3gs connection to the ipad allowing you to use gps with maps, surf the web etc on your ipad. This is called a 'personal hotspot' which every ipad and iphone have built in and sets up instantly and automatically when the phone gets within range of the ipad. This is a major plus when you consider you can now get a first generation ipad that is wifi enabled for a few hundred dollars second hand. I cannot see how any other headunit or carputer can come close to competing with an in car ipad in terms of quality, price or functions and flexibility.
All a bit of a mouthful but I thought it might save someone the time if they share my goal, and they were heading down the same path that i've just been. That and I feel pretty bad for recommending a jaycar product that turned out to be crap. I'm sorry if you went out and bought one on my recommendation and it has turned out the same

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