World_Base_Map.cosm is the map which is opened by default by Land and TwoNav App.
This map gets data from an online server. This server was OpenCycleMap for some years. But, some months ago, the propietary of this server changed the model and now requires a payment. If not payed, APIkey Required message appears on the map.
By now, TwoNav will not assume this payment, so the message will appear.
Since this happened, we changed World_Base_Map.cosm so it is not getting data from OpenCycleMap, but OpenTopoMap.
If your World_Base_Map.cosm is still opening OpenCycle (so showing APIkey Required message), please try to download it again from Data Tree (Online files > Online maps > World).
OpenCycleMap can still be accessed, also from data tree, but APIkey Required message will be shown.