Dave,
you looking for a backup wheel pilot, less expensive or
under decks? we have a simrad wheel pilot for backup, which we
did finally have to use and it worked well, but we are a smaller
boat (38 ft). there's also the cpt wheel pilot, which is supposed to
be good too but may have issues. Mike Toledano here on the board has
one and has info.
underdeck, I have a Ray st6000. old, reliable, 25,000 miles+ just had
gears replaced in drive. its my only underdeck experience.
RickF