Here one how Accurate can is a compass.
This helps
The resolution on a digital component is 0.1° .
Using solar north a simple way of finding Longitude gives a location to at the Equator of lessthan 7 NM. The closer you get to poles greater accrucy.
This using a simple sundial solar noon only and very large compassion.
At 35° latitude accrucy within 3.9 NM .
Accrucy on Ladatude using a veneer type sextant with a 6 minute veneer is 6.8 miles.
On 6 min veneer can easily read to 3 minutes or 3.4 miles.
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Dave
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davesmith1800