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Explanation: Aufsicht (math./tech., einer Zeichnung) - top view or plan
[Muret-Sanders, Enzyklop. WB]
(I think the more common German term is Draufsicht, cf. Ernst)
Top view map is borne out by these (and more) references:
A detailed top-view map shows the trail's most difficult sections and other notable spots, such as bridges, rivers, waterfalls, and rest areas. www.beneficialdesigns.com/services/pcktmap.htm