grumman goose water taxi

how do you water taxi properly in the goose?for example, i have failed the peruvian mission 3 times because i crashed while trying to turn around to taxi away from the temple.is there a water rudder or something?the floats are down and im using the rudders to turn

I hit the button that brings the Throttle in the upper of the screen...Then i trim the craft by giving power to one of the two engines according to where i want to turn

I put the landing gear down and then taxi on to the land went around everything and back into water to take off