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On Sat, Nov 22, 2014 at 1:16 PM, Yves Robin-Jouan
 wrote:
> Nethertheless on 1780, Captain de Latouche did not used Lunar distances for
> Hermione Atlantic crossing. Indeed, neither Lunar Distances, nor marine
> chronometers !
>
> Captain de Latouche used only dead reckoning and sun meridian latitude. At
> last, he knew that his longitude was false (due to a problem with his loch
> or log) and he maintained the latitude of Boston bay during several days.
> His longitude error was 295 NM when arriving at Cape Ann !

A longitude error of 295 NM is comparable to that experienced by the
USS Constitution in its first Atlantic crossing, under the command of
Edward Preble in 1803. Judging from the log entries, the navigation
was entirely by noon latitude sights and dead reckoning for longitude.
By the time they reached Spain, their reckoned position was off by 213
nautical miles.

Upon entering the Mediterranean, all navigation seems to have switched
to coastal piloting techniques.

Don Seltzer

   

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