Affordable Radar Option $11 for the Iphone

there a number of AIS apps that are free. try 'marinevessel.com' big ships use class A, smaller boats use class B. there are many small vessels who currently have AIS. this is a RF system so line of site to the antennas is a limiting factor just like your VHF radio. in other words. you can't really count on AIS.
 
I don't use it but thought for the weekend warrior that has an iphone it was a pretty neat and cost effective option. A person if they have 3g could just go to the AIS site online and use the live feed for that matter again free.
 
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