Ais
as ministry of transportation in qatar the minimum requirement class B AIS transponder & any mobile DSC VHF radio , I found dealer for Vespermarine in qatar i bought on for 800$ with full accessorise and antenna
some stores in qatar they selling AIS S.A.R.T and AIS beacon as AIS...
I bought Vesper Marine XB-6000 AIS Class B transponder
box one you can connected to the boat battery , i dont like the Identifier because maybe you forget it at home when you charge it or the battery die on board