Going the other direction, I use a Garmin 369 on my airplane. It has a feature that may not be widely known in the sailing community, so I thought I'd mention it. It downloads real time doppler radar using an XM satelite radio feed. It cost $2195, but can really keep you out of the weather. The montly cost for the XM data is $25 for doppler and other weather reports, or $50 if you want lightning strike data. You can change your level of service at any time, but you do pay 3 months in advance. Being a pilot, weather was the one thing that always concerned me - now I am much more confident about longer trips.
ps: I'm pretty sure garmin makes a marine version of the 396 at a lower cost, and there are also other devices which can display the weather from XM if you already have a gps.