Mercator Sailing: Course and Distance

08302018, 05:49 AM
Post: #12




RE: Mercator Sailing: Course and Distance
(08292018 09:02 PM)Gene222 Wrote: Okay. You convinced me. I will use your ATANH formula (the first one). The formula really does need to be accurate to transition to the formula for the EastWest course. It is. For lat1 = lat 2 use the formula from post #5: Code: 1 – e²·sin²(lat) Check it yourself: calculate the distance for two almost identical latitudes (say, 40 and 40,00001 degrees) and compare the result with the above formula. (08292018 09:02 PM)Gene222 Wrote: I think I got the program just about done, but I need to recheck it to see if I got the signage right for all cases. I got hung up on the 0 and 180 degree meridian crossings. Make sure the absolute value of long2 – long1 does not exceed 180°. For example, 250° East is equivalent to 110° West. Continue with this longitude difference. Dieter 

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