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Jack, just about all of those that are non-Nav centric (RTTI is obviously nav related) are doable withou Nav, including Voice Control. The US rear PDC, does have a nice display, but if you're backing up, you won't be looking at the display anyway. You'd be listening to the increasing beeps, and looking out the back window.
Stopwatch is one thing I can think of on the Nav, not on the non-nav, but I have it and never used it in 3 years yet.
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