The “Go to…” menu can be used to navigate to arbitrary coordinates not bound to any geocache or geocache waypoint or to make a waypoint projection.
Technically the “Go To…” menu brings you to the waypoint tab of a c:geo internal cache. So the usage is exactly the same like for waypoints of every other cache in c:geo. Please refer to the waypoint tab and waypoint editor description on the linked page.
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On this page of the user guide we only describe some typical use cases.