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  1. As you know, the one in 60 rule is that you are off course one degree for every nautical mile you would by off course if you had travelled 60 miles. So, for example, if you are off course one mine after flying 10 miles, you are off course six degrees (6 x 10 = 60). I wondered how accurate the rule is. As far as I can tell, very accurate up until you are 40 degrees off course. Below is what I hope is the graph of the error of the one in sixty rule. The y-axis (up and down axis) is is error. There is no error at zero and thirty degrees. The x-axis is the course. The black line what the one in 60 rule says is how far off course you. The blue line is how far off course you actually are. As you can see, when you are 90 degrees off course, the one in 60 rule says that you are only 60 degrees off course. At about 17 degrees off course, the rule overestimates by about 0.5 degrees. At 40 degrees, it underestimates by only one degree. Amazingly accurate for something that is supposed to be a rule of thumb.
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