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You should be able to get a good sense of scale from the photos but in case you can't the disc shaped maps are slightly larger than a vinyl record (of the 12 inch variety).
The maps are always direction oriented as opposed to compass oriented - so when you're looking at the map the top of the map is the direction you're facing.
you'll also find the "you are here" dot with rings drawn around explaining how long of a walk things are.
The signs have been around for 10 years with few problems and lots of praise.