Evening all..
Great question. Reinforcing Crab's eloquent post -as the Winchman you really dont want to be disconnected from your primary means of rescue; the SAR Aircraft (should the in-water rescue go wrong). And the ability to be 'trawled' throught the water towards your casualty whilst connected to the aircraft, regardless of sea state or weather, is our efficient means of rescue and recovery this side of the pond.
Regarding stropping versus rescue basket method. Having never used the basket method I aint sure. However, the guide books for us dictate that should a casualty be immersed in the water for 'longer than ten minutes or time unknown' the hypothermic lift method using two strops, one over head and under arms with the other placed under the knees, should be utilised. This brings your casualty up to the cab in the semi recumbant position, pooling what warm blood to the poor sod has left pumping around them in their core and not plummeting to their boots. (Sadly as discovered in the Fastnet tragedy many years ago) It is also a very comfortable and reassuring method of rescue and recovery for casualties who are gonna be bricking themselves/injured/near deaths door already. And to do be rescued with your Winchman whilst connected to the winch together can only be an even more reassuring and 'calming' means of recovery rather than being sent upwards by themselves!
Regarding winching to a yacht. Perhaps you need to have a wee look at our Hi-Line method. This is a simple procedure we use ALL the time for winching evolutions to yachts, cluttered fishing vessels, boats with limited/little winching areas, cliff ledges etc. With great effect and, usually, extremely successfully.
Lads/Lassies, wishing you all the safest best wishes in SAR for 2010
Ray