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Update README.md

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Ben Jabituya 2021-01-13 20:33:02 +00:00 committed by GitHub
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@ -15,7 +15,7 @@ Functions
The text will turn blue during calculation and then back again once complete.
When you first install it, all positions will be estimated from UK as the default location and all the text will be white; from the moment you get your first GPS lock with the clock, it will save your location, recalculate accordingly and change the text to red, ideal for maintaining night vision, the calculations will also now be relevant to your location and time. If you have not used the GPS yet, I suggest using it outside briefly to get your first fix as the initial one can take a bit longer, although it should still just be a minute or 2 max normally.
Lat and Lon are saved in a file called **astral.config**. You can review this file if you want to confirm current coordinates or even hard set different values \- although be careful doing the latter as there’s no error handling to manage bad values here so you’d have to delete the file and have the app generate a new one if that happens, also the GPS functionality will overwrite anything you put in here once it picks up your location.
Lat and Lon are saved in a file called **astral.config**. You can review this file if you want to confirm current coordinates or even hard set different values \- although be careful doing the latter as there’s no error handling to manage bad values here so you\’d have to delete the file and have the app generate a new one if that happens, also the GPS functionality will overwrite anything you put in here once it picks up your location.
There can currently be a slight error mainly to the Az at times due to a firmware issue for acos (arccosine) that affect spherical calculations but I have used an estimator function that gives a good enough accuracy for general observation so shouldn’t noticeably be too far off. I’ll be implementing acos for better accuracy when the fix is in a standard release and the update will still include the current estimate function to support a level of backward compatibility.