WP30.
Is what I installed on my H37C with a displ. over 18000#. I liked it's clean, simple, design and installation. It handles rough Lake Erie when the North winds blow, stays right on course. There's no fluxgate to install so you only run one wire down the pedestal. That one cable handles the 12V plus GPS/wind/etc. There's no separate display like the Raymarine and some sailors want that. It seems to use very little of the battery. I adjusted mine so that it doesn't "hunt". Three summers and nary a problem.