Just read about "The Weather Channel's" marine forecasting units. Pretty nice, tons of features like surface water temps, etc. and will become compatible with Raymarine and possible other new electronics in the future. Cost for the receiver & antenna is $1,500 after rebate, $80 activation and either $695/yr or $395/6 mo subscriptions. Right now it is only available with laptop or Maptech i3 nav/display.
Garmin's is cheaper but still have to be in a never ending loop of monthly payments forever to subscribe. My wife and I have XM sat radio and enjoy getting Fox News and all the stations, maybe they will come up with a "Family Plan" to include Radar. Could use this in an auto, say if a tornado is coming down the interstate.......could be a worthy "business" expense for those who have corporate vehicles.