Digressing for a moment, is anyone else fascinated at how many coincidental phenomena exist that aid in navigation? I mean, it isn't like someone stuck a bunch of arrows all around and little monuments, but I find it beyond coincidence and intriguing that, with a little mental effort on our part, virtually all the answers are there for us. It just seems like someone created this system where the answers weren't obvious, but if we sat and thought about it and applied our reasoning ability some, we could solve the equations that help us get around. It is almost like someone wanted us to go explore and discover and figure it all out, but they made it so we had to earn it. Everything from the magnetic pole, to the starfield, to time, to trigonometry, to rf propogation, it is all there, but had to be figured out first before we could see it.
It reminds me of handing a kid a paper with a bunch of numbered dots, telling him to connect them in order, then to color the resulting geometric shapes a certain way, based on certain rules. Only after doing it all can the kid see that he has made a picture of a sailboat on the water. This is just way too cool.
Now we have GPS, and so all those skills we had to develop along the way aren't so necessary anymore; just push a button and all the answers are there. At least until the button breaks, in which case we get to re-learn all those great methods again.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)