I have had great luck with my Garmin 440s (the older version of the 441s). The screen is small but that has never been a problem for me. I am adding a second Garmin 441s this year, i will now have one at each helm on my boat.
1985 Carver Santa Cruz 26' "Casey Marie"
1992 Boston Whaler Montauk 17' "Whaler One"
2009 West Marine Zodiac 9' "Little Buddy"