How to install Ubuntu Night Light?

Imagine plotting an expanding square search were it is a rectangle each leg getting longer than the other from the last known location of the Lost craft. Or a parallel search along a shoreline working back and forth and up or down the shore line? That's using estimated speed x time = distance. There is no speedometer on a rescue boat,only rpm's. Now figure in the tide tables.

That was search and rescue navigation. GPS has changed all that.

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