Astrotracer do not really need GPS

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Roland Karlsson Forum Pro • Posts: 29,107
Astrotracer do not really need GPS
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Exact coordinates are not necessary for atrotracer. You only need a very coarse number for your latitude. So, if you can insert the latitude manually to your home, then you can use this as long as you are taking images in the neighborhood. I am at latitude 59.3 degrees North.

Astrotracer needs to know direction to the geographic north and also how the camera is tilted, in all three axis. The direction it can get from the compass, and the tilt from tilt sensors. All those sensors needs to be calibrated and accurate.

Those sensors are probably not accurate, and the least accurate is the compass. Note that the compass needs to be adjusted for magnetic north and for magnetic disturbances. The compass is the largest cause for errors.

ALTERNATIVE SOLUTION

It would also be possible to make a self calibrated astrotracer that do not care about anything at all. It simply takes a long test picture and then uses the arcs to determine the center of rotation. BTW - to see if the stars are in the northern or southern hemisphere you need to take two pictures.

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/Roland
Kalpanika X3F tools:
https://github.com/kalpanika/x3f

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