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Marine VHF/AIS Range

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What sort of typical range should I expect from the VHF/AIS. 

I get there are some variables in this, but today for example I was only intermittently picking up the ferry on AIS when they were 2.8NM away with some terrain in the way.... see picture.
AIS and VHF share an antenna with the appropriate splitter. (XB8000 and a Standard Horizon VHF - Furuno antenna (looks old))


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I’ve frequently seen ships at 30 to 40nm however class B to class B will be only 7 to 10nm depending on the mast heights and sea conditions 

Transmission intervals vary according to your speed and theirs also so if when they transmitted if you had a house or land in the way you wouldn’t receive their transmission 

VHF will bend around corners but not reliably so that’s why sometimes you would pick them up.

Hope that helps

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If the antenna (and coax) is 10yrs + is will have degraded. It's often the Class B AIS that shows this 1st. Change the cable and co-ax - they are not expensive.

Class B should Always give you 7-10 miles across water. Ships with class A should be 20 miles if your antenna and theirs are line of sight. I have seen over 100 Miles once, but that's weird atmospherics.  I one had a ship call me from 46miles and ask my intentions - I didn't even know he was there!

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