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    Waves and Dip
    From: Mike Freeman
    Date: 2019 Dec 7, 22:12 -0800

    "It is normal on the ocean to have a sea running, in the NE trades in mid atlantic there will probably be a ground swell of 8 to 10 feet in height. In the N Atlantic after heavy weather there could easily be a swell running to 20 feet or more. If this is the case youll have to estimate the wave height, divide by 2 and add the result to your height of eye, youll only see the horizon from the top of a wave so that is where youll be when you take your sight"

    I was surprised to read this.

    My imagination tells me when my small yacht is on a crest my horizon is also made up of crests so no adjustments required?

    I also read some other special instructions for taking sights in large waves which I am unable find but were different to either of the above.

    I guess different vessels vary?

    Look forward to replies


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