Mercury Marine has a system available on their Digital Controlled Outboards (DTS) which means their four stroke Verado line. The Mercury system is called Smart Tow. I checked into it and WOW. It seems they have not really promoted this product at all to water skiers. There is only one true tournament style outboard boat manufacturer (Dyna-Ski) and this is the first time I put my nose to the grind stone, kept asking, calling and emailing. Obviously they had not told me either until now.
Mercury developed it and it is readily available now and has been for awhile. Few people know much of anything about Smart Tow even at Mercury. Smart Tow has several levels of upgrades including one for Zero Off. I'm still researching what the Zero Off system adds and how it works.
The Mercury SC1000 Smart Tow system has pre programmed launch controls. Once the skier is "launched" onto the water the driver can set the speed the skier wants. RPM's, GPS or a paddle wheel pickup data is used to monitor the speed. Stepping up to the Merc Monitor allows the operator to custom make launch profiles, save and use them. Mercury suggests power steering with their Verado outboards.
Launch Control: Sets and controls the speed of acceleration from idle to set cruise speed for Smart Tow Tachometer and Speedometer.
Cruise Control: Sets and controls the speed of the engine for cruising on Smart Tow Tachometer and Speedometer.