@capn
Post 8 explained it fully for me. The other explanations above by both you and Neil are just saying the same things but in different words as far as I can tell. Simple really, the basics:

1) Full Standalone CX doesn't need a separate City Navigator on the nuvi but a Small CX does

2) Enhanced Pedestrian Mode only works if the MMR has an unlock code because it can't be unlocked any other way

That's the "Must Knows/Should Knows"... the rest is "Could Knows" or "Who Gives A Toss" so if a user understands 1 & 2 the rest is just fancy footwork......