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Traditionally in ocean navigation, DR is based solely on speed, time,
and course steered.

If one is sailing with a known leeway or set and drift of current, one
adds that information to the DR to arrive at an estimated position (EP).
  Usually a dotted line is drawn between DR and its corresponding EP and
the information used to determine the EP is labeled on the line ("leeway
est 4 degrees" or "current, set 295, drift 0.5 kts")

Lu Abel

Greg R. wrote:
> Clive wrote:
>
>
>>Does  anyone know of a really good way of checking leeway?
>
>
> Along those lines, is it common in ocean navigation to try to estimate
> set and drift (and I'd guess true wind and leeway, too) and factor that
> into the DR position estimate?
>
> I know that in aviation navigation we have to calculate the heading for
> a given leg based on wind correction angle, but I've never seen any
> reference to a similar allowance being made for that by our ocean-going
> counterparts.
>
> --
> GregR
>
>
>
>>Hi All;
>>
>>Back online again after a long while!
>>
>>Franks recent mail about using floating styrofoam reminds me that I
>>suggested using this as a means of checking leeway (by back bearing
>>on a floating paper plate) some while ago but nobody took this up I
>>will try and revive it..
>>Does  anyone know of a really good way of checking leeway?
>>
>>Clive.
>>
>>
>
>
> >
>

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