They contacted a scam artist. Some guy came up in front of the entrance to the pier, offered a tour (110 lira each). I asked him five times, and he said in broken English that in an hour we would sail here with a stop across the strait. The stop across the strait turned out to be the final one. We were kicked out, we took a taxi 20 km back.
The ship is good, the view of Istanbul at night and the Bosphorus is simply magnificent.
Before you go on a trip, it is better to understand the details and buy tickets at the ticket office)