ST3000
I have one on my 28, and it has served me very well for several years. It does have problem in a following sea, to the point of being basically useless. Other than that it is a good unit. I have single handed offshore a lot using mine. I have total trust in mine, and it does the job it I am sleeping.Had a problem with it when it was still in warranty, and Raymarine fixed it promptly. The new S1 is no doubt superior, but unless you just want to spend the bucks on the latest and greatest, I would keep it as long as it works.