You are correct. Some fishing activities do not require training and certification. Please visit the Direktion des Innern Amt fur Wald und Wild. They are at Aegeristrasse 56, 6300 Zug. On the first floor. Last year I was there, the lady was super helpful. If you haven't got the licence yet, you can get it there /it will come by post a day or two later/ and you will also get the map of the Zugersee with fishing boundaries clearly marked. You will also get a leaflet in English with vital information. You can rent a motor boat actually and go off fishing offshore, but within the boundaries.
By end of October /as far as i remember/ you will need to post your report on caught fish. It is compulsory. You will get the form with all other info.
I have attached a couple of images to give you an idea, i hope images are there...
I give up... Images are too big and it's just too much fluffing with them. Sorry...