Salty gives excellent advice for you. There is a simple, if not totally correct, method to handle "Rozenburg" and that is illustrated below. Use the drive lever from one motor and the transverse lever from the other one. (i.e. using motors at opposite ends of the vessel). At full speed on the driving motor you will get a maximum rate of turn of approximately 320 per minute with the transverse lever fully to one side, this will quickly reduce to zero when the lever is centred. If you reduce speed you will get a faster rate of turn but you must be careful not to get the balance wrong. But as Saltydog says, it is very well worth playing about in "Free roaming" until you get more competent with handling her.
Angus.