Uncertainty in atmospheric refraction limits exactly how accurate you can get. Celestial Navigation books say it's better to make several measurements of the s

Uncertainty in atmospheric refraction limits exactly how accurate you can get. Celestial Navigation books say it's better to make several measurements of the same star than to measure a bunch of different ones. From what I understand, some land surveyors often still use a sun sighting to determine true North. GPS has the advantage of working when it's cloudy, or when the sky is blocked by trees or buildings. And a GPS receiver is pretty cheap, durable, compact, and foolproof compared to a telescope and camera system which will have to be recalibrated regularly.