Hi Ian.
I will assume you are using a 2channel set for the seaport refurb. Below the sticks on the transmitter they are numbered
(1) right hand stick (2) left hand stick. You will note the right hand stick (1) moves left -right this is the stick for the rudder and corresponds to hole no1 on the receiver for the rudder servo. The left hand stick (2) moves forward-reverse this is the stick for the speed controller and corresponds to hole no (2) on the receiver.
There is also a slider switch next to each stick this is a trim switch and is used to centre the the speed controller or the servo arm on the rudder servo.
frank.