2 = 6.452 cm 2 1 mile 2 = 640 acres 1normal section2 Angles 1 revolution = 360 degrees = 2p radians 1° 1degree2 = 60′ 1minutes2 1′ = 60″ 1seconds2 1° = 0.017453292 radians 1 radian = 57.29577951° = 57☁7′44.806″ 1 radian = 206,264.8062″ 1 revolution = 400 grads 1also called gons2 tan 1″ = sin 1″ = 0.000004848 p = 3.141592654 Other Conversions 1 gram 1g2 = 0.035 oz 1 kilogram 1kg2 = 1000 g = 2.20 lb 1 ton = 2000 lb = 2 kips = 907 kg 1 m>sec = 3.28 ft>sec 1 km>hr = 0.911 ft>sec = 0.621 mi>hr GPS Signal Frequencies Code Frequency (MHz) Errors and Error Analysis 68.3 = percent of observations that are expected within the limits of one standard deviation 0.6745 = coefficient of standard deviation for 50% error 1probable error2 1.6449 = coefficient of standard deviation for 90% error 1.9599 = coefficient of standard deviation for 95% error error2
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