Is the object 25 metres tall or more in a non built-up area or 60 metres or more in a built-up area?
You must register the object on the DCS portal.
Is the object 100 metres tall or more?
A permit from the FOCA is required. The same applies to wind turbines, high-voltage power lines and slacklines at 60m or above. You can register the obstacle and obtain a permit on the DCS portal.
Is your object located within an aerodrome's obstacle limitation surface (OLS) or in the vicinity of a helicopter landing site?
In this case, a permit from the FOCA is also required. Plants (especially trees) can also penetrate the OLS as they grow and thus pose a danger to aviation. You can register the obstacle and obtain a permit on the DCS portal.
Play it safe, because you are responsible and liable in the event of damage! The DCS portal allows owners to check when registering whether the reported object really constitutes an air navigation obstacle, whether further measures such as marking or lighting are necessary or even whether an inspection and authorisation are required.
Have you spotted an air navigation obstacle?
Pilots are required to update the navigation systems periodically and to keep themselves informed about changes to obstacles.
They should also notify the FOCA of any installations they have spotted that are not included in current publications or which appear incorrectly, or whose marking or lighting appears to be inadequate. This can be done via Pilot obstacle report, providing as precise details as possible.