I would think your 55SD would have them as well. They are just 2 vinyl soft pads to lay out on. They are side-by-side and covered with a canvas snap down cover. You would know if you should have them because there would be 2 recessed areas on your...
I think you are going to need something more "official" to figure it out. They are not rectangles. They have an odd shape and they connect through slide-in tracks on 3 sides. Honestly if it were me I would just have rectangles built and put in the...
One thing to remember. The R70s does not work entirely with all course computers. It actually will not allow for heading alignment with my course computer. It just so happened that when I plugged it in, it had the correct heading. What model cour...
I just replaced my 650 with an R70S. I bought the R70S from raymarine.factoryoutletstore.com/. You can easily find the course computer because it is connected to your 650. Just trace the wire. It is almost assuredly under your dash.