Had both
I've had a Ray 4000 on a 1981 H-30 and I now have a Simrad on my 1984 H-31. I bought the Simrad for the ease of installation and location of the control pad.As for a comparison, the Ray 4000 held a tighter course by 5 degrees. However, it may be a difference in the boats. My Simrad does annoy me a little when motoring. It will deviate 5 degrees to either side of set course which totals 10 degrees, as where the 4000 held to a total of 5 degrees. When set to the book specs it will over stear in auto tack mode. If it is set up to tack properly, it will under stear in normal sailing. I don't find this a problem, as there are few occasions when I would use the auto tack, even solo sailing. As I said before, comparing the units on two different boats isn't a good comparison. It sure was nice not to have to cut a hole and string extra wires.