Summary: I'm a big fan of Garmin products but this unit has been somewhat of a disappointment. The sonar in particular performed weakly - sometimes not reliably showing bottom 20 feet down if soft or weedy. The unit would also often reboot when experiencing shock, say hitting a big wave. After two years I replaced it with an Echomap 50S which has been superb - better in every respect.
WARNING - impossible to install due to cable connector / mounting arem incompatability. Do not purchase !!
25 July 2014
Summary: this is the most badly designed unit I have ever purchased. It just DOESNT WORK as shown. The picture shown is impossible to replicate due to the cable connector sticking out too far. If the mounting bracket arms were 0.5 inches longer the cable connector wouldn't snag on the bracket, but the arms are too short. If you install the cable you need to cut away the cable guard in order to get the unit to sit horizontally. Tilting upwards is impossible.
Summary: This unit is practical for the money and easy to operate. Small display of four inches yet plenty crisp visually. A little delay in panning and on screen navigating, but manageable. The 441s is a good choice for a smaller fishing boat.