Many thanks to one of our past Boat Chairman Nigel Pype for supplying the following information.

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Ch no usage
16 = Coastguard distress / safety, calling channel (not for casual use). 00 = Coastguard emergency, do not use!
37(m2) = E.A.A....and most sailing clubs inc.' Eastbourne, Newhaven & Brighton marina's. M2= as above.
4 = spare do not use.
6 = 1ST inter ship channel.
8 = 2ND inter ship channel these four channels are the only ones allocated.
72 = 3RD inter ship channel for inter ship use in UK waters.
77 = 4TH inter ship channel.
10 = Coastguard and oil pollution control channel.
13 = Navigation safety inter ship channel.
17 = Sovereign harbour ship to shore.
11 = Sovereign harbour inner basin.
12 = Newhaven harbour radio.
14 = Port operations, used by Rye and Shoreham harbours.
67 = Coastguard small craft safety, rarely monitored except in Solent.

70 = Future digital distress channel, do not use.
73 =2 ND coastguard working channel.
74 = Alderney port authority.
80= used by yacht clubs and marinas.
88=coastguard weather and navigation channel.