You can create user defined caches with c:geo. Those can be used e.g. for planning your own caches as well as just for recording some points of interest.

You can create user defined caches in two ways:

1. Open a list of saved caches and select Manage Caches → Create user defined cache from the list menu.
2. Long click on the map to trigger creation of a user defined cache. This long click function needs to be enabled in map behavior settings.

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