The SAR unit is variable in length because of the different levels of precision required depending on the type of rescue. Fwd 1 could be as little as 6 inches if you have stopped just short of a cliff-sticker and the winchman needs to be pressed onto the cliff face.
Tiger Mate - if we are inadvertantly descending, the winch op will say 'you are sinking' - maybe that's why the Navy don't like it
Fwd 1 back 6 is pretty standard patter for surf drums/wets!