The T6J enables 15 different models to be programmed on the transmitter. (so two boats will be no problem) If you are programming two boats it would be best to have two receivers, one for each boat. As far as programming the winch you will be using the endpoint adjust on the throttle channel (EPA). You are best to set the mid point of the winch to the centre position of the transmmiter stick and then set the end point of the required sail movement as near as possible equally either side of the stick mid point. (I normally take off the winch drum and then switch the transmitter on with the stick in its cental position so a multi turn winch finds it cental position, turn off transmitter and then put the drum back on with he sail sheet takeoff at the mid point in its travel.) If you get this wrong it is possible to damage boat or servo. If you are using an RMG winch talk to someone over setting it up as most don't use EPA for them. The Futaba T6J is/was a popular transmitter for radio yachts so I would expect a skipper from Hampton Court Club should be able to help you. As with most of these things it is generally easier to show someone rather than explain verbally. So for basics you need to be able to create a model name or just a number(I normally use design name). Then how to navigate to the End Point Adjust (EPA). I must admit I don't find the Futaba as intuative as the Spektrum DX6 to programme. Each to their own! More of our members use the Futaba. If uncertain, best to ask at the Lake on a non race day or ask to meet a member who can help at the club to prevent damage.