No definitely (4,5) unless there is a printing mistake. Thought perhaps it might be Star chart - take ARCH (as in building) out of the middle and Im left with START? Not sure thought.
I think STAR CHART is ok sfulton.
As you say, take ARCH for 'building' and you are left with START for 'begin'.
giving you the answer for "a map" which could be a star chart - which is a "map" of the night stars.