The band itself is very easy to check - very quick and rough check is to check the height of the Polar star in degrees over the horizont that is the angle between the star and the horizon (not the bottom of the screen). And that will give you your latitude (providing you are in northen hemisphere where the star is visible). For example - if the star height is 30, then you are on the 30 latitude. Compare it to the actual posit.
To check the longitude you need to set your position exactly at Greenwich meredian, i.e. long = 0. Then the sun should stop rising (use band to check sun height) exactly at 12:00PM and after it should start to descent. If your posit is 15 degrees westerly - then the sun will be at its zenith at 1:00PM, i.e. every 15 degrees to the W give you +1 hour to the noon time as compared to GMT. 1 degree W gives +4 min.
We must also check if the sun's position corresponds to lat. It is slightly more difficult. I'll explain later.
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