The spiral binding allows map reading by the navigator and makes their job easier. the full size A3 book is harder to handle in the passenger sat. the scale is that little bit larger and gives detail. Also the book fits in the map case on the back of the seats, so is easier to stow away. Altogether a good practical route planner and far better than that stupid, patronising, errant sat nav.
Excellent product for sitting on the knee whilst passenger navigating,lacks a little in size from a vision perspective but you can't have it always.
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