Not on the new Raymarine units -- they're made to not need one, but you can add it if you want. From what I've heard, there's only a marginal performance improvement now with having one, vs. not having it.
Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( On Oct 1, 2012, at 9:44 AM, Della Barba, Joe wrote: > Don’t forget you’ll need a rudder reference unit as well.
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