Well, if you ever wanted proof that you shouldn't believe everything that you read on the web, you have it. That post was laden with errors. Sextants are used for navigation - primarily to calculate your latitude - but it can also be used to find your position on a map by shooting two landmarks. I own a sextant and would love if the author of that post would explain to me how I can use my navigation instrument to "track the flight path" of a rocket. I'm equally impressed that he has also located evidence that definitively connects the M-B with the rocket program.