I use a Simrad TP-32, installed in 2013 to replace an earlier Navico
TP5500 and provide NMEA2000 connectivity.
It has worked very well to follow routes under power
during summer cruises in the light-air Pacific Northwest
. It plays well with my B&G
MFD and also with OpenCPN
on a PC.
It also works well under sail in light conditions. However, in heavy air I wouldn't rely on any electric-powered tiller steering
unit--the pin-connection to the tiller isn't very robust, the power
draw is significant, and the heavy steering forces would likely wear out the motor
rapidly. A proper wind vane
steering system would be preferable.