[Paddlewise] Wave Speed - (totally trivial question!)

G'Day,

Can anyone tell me if all (sea) waves travel at roughly the same hoizontal 
speed (relative to the current of course). I've been trying to observe if 
this is the case for some time and am coming to the conclusion that they do 
but am not sure if they speed up when approaching shore?

All the best, PeterO

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