I know this is an old OLD thread, but now we have more technology.
My FAVORITE boating app is 'Radar NOW', it's an Android app that has all the weather radar showing in real time. That's all it does, weather radar.
I check it before I leave the dock, and check it periodically while on the water if there is a possibility of a summer storm. I can usually watch the storm cells floating across NH and have a very good idea of where they are tracking.
Check it out:
https://play.google.com/store/apps/d...adar_now&hl=en
I don't know if they make an equivalent iPhone app.
This one is unique in that it does ONE thing very well, Weather RADAR. Yes, I know there are other weather apps out there, but this one is outstanding IMHO for this purpose. Oh, did I say it's FREE!