RE: The unofficial Home of all that is Nitro Vee...
use the duratrax micro failsafe, cheapest and works great, a failsafe and the RTS do not work together though, the RTS uses the throttle servo for activation when the boat is stalled, a failsafe cuts throttle if radio reception glitches for longer then a second or so and also if rx battery power gets to low, stopping the chance of a run away boat, if the failsafe kicks in there a good chance your going swimming or fishing to get it back. basicly just for emergencies whereas the RTS is a convinience thing.