For a sailing boat with a auxillary motor over 5 HP you need a certificate for skippers on pleasure crafts with motor on internal waters. If you want to sail in Berlin, too, you have to get a certificate for boat drivers on pleasure crafts with motor and under sails for internal waters (SBS Binnen)

For SBS Binnen schedule a free weekend and 2 til 3 further evenings for theoretical training, about 5 free forenoons at weekends for practical sailing training, some time for learning theories by yourself, a friday afternoon and a saturday forenoon for the theoretical and practical examination and a budget of about 400 €.

But perhaps the lake gets too small for you. You want to explore the sea.

To sail with a opti near the coast you don´t need any driving licence. But we assume that you want to charter a yacht at the Baltc or the Mediterranian Sea. For that you need at first a certificate for boat drivers on pleasure crafts at sea (SBS See)

Schedule for that 2 further 2 weekends, 2 til 3 further evenings for theoretical training, 2 til 3 hours for practical training, time for learing theories by yourself, a friday afternoon and a saturday forenoon for the examination and a budget of about 300 €.

Now you may not use the radio equipment aboard yet.