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I need to look up whether they carried chronometers. The Harrison clocks/chronometers were well established by 1805. But how many chronometers were in American hands?

Could they survive the voyage? Sea voyages are one thing. Banging about in keep boats, canoes and horseback is another! I will look that up!

That said, they could Do something the Mariners couldn’t. They could take sightings to landmarks and pace Off distances. So they may not have needed a chronometer to keep track of Longitude.

But great question and I will do some
Digging on that!!

Sirhr
Prior to chronometers, the moons of Jupiter were used to estimate GMT. That sucked at sea due to the motion making observations with a high-magnification telescope problematic at best. On land it was relatively easy.

Pacing off distances is probably not the most accurate way. I suspect they might have used a system of triangulation from landmarks. Sextants are also great for making very accurate horizontal angular measurements.
 
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