If size matters, then I agree with you; the 700 series (or the 276cX) are excellent choices for 4 wheels- I use both in my 4x4. When it comes to real life usage, the 66i out performs my 64st, MonTerra and 680 Montana; it is pretty much on par with the 700 and shares much of its interface with it.
As far as specs and performance are concerned, the differences are very obvious and I do not use the selling price as a yard stick.
I did look at the Garmin Overlander but its IPX5 and only 3 hr battery life were some of the features which put me off. Though the ‘pitch and roll gauges' would have been a useful feature in the 276cX but that unit makes up for it with other features which I prefer and which are more important to my navigation needs.
As I've said before, the 66i's small size is perfect when out/off the vehicle and is very discreetly tracking when visiting unfamiliar places. It also gives you both the SOS option and the navigator in one package.
Horses for courses! And I would encourage any prospective buyer to do their own research and comparisons. These are just my opinions and choices and they all work for me
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I do not list my vehicles or the places I have travelled to nor do I live my life seeking validation from others.
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