Mercator Sailing: Course and Distance
09-22-2018, 11:37 PM
Post: #23
 Eddie W. Shore Senior Member Posts: 1,578 Joined: Dec 2013
RE: Mercator Sailing: Course and Distance
(08-12-2018 05:13 PM)Dieter Wrote:
(08-10-2018 03:08 AM)Eddie W. Shore Wrote:  Latitude 1: 102° 54’ 16” W = 102.9044444444°
Longitude 1: 43° 21’ 16” N = 43.3544444444°
Latitude 2: 106° 3’ 8” W = 106.0522222222°
Longitude 2: 42° 4’ 30” N = 42.075°

Results:

Course: 5.782390957°

Distance: 189.832588 mi

Eddie, I think you confused latitudes and longitudes here. There are no latitudes > 90°.

I also wonder how you get these results. For the given data I get a distance of 159,03 nmi and a course of 61,14° Southwest (241,14° true course). This matches the result of an online calculator where I checked the results.

Finally, what sign convention does your program use? Are West and South positions entered with negative sign?

Dieter

I always get latitude and longitude mixed up. Going by the book's examples (pg. 78), north and west were entered as positives.
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 Messages In This Thread Mercator Sailing: Course and Distance - Eddie W. Shore - 08-10-2018, 03:08 AM RE: Mercator Sailing: Course and Distance - PedroLeiva - 08-10-2018, 11:23 AM RE: Mercator Sailing: Course and Distance - Dieter - 08-12-2018, 05:13 PM RE: Mercator Sailing: Course and Distance - Eddie W. Shore - 09-22-2018 11:37 PM RE: Mercator Sailing: Course and Distance - Gene222 - 08-24-2018, 07:21 PM RE: Mercator Sailing: Course and Distance - Dieter - 08-25-2018, 06:08 AM RE: Mercator Sailing: Course and Distance - Eddie W. Shore - 09-22-2018, 11:39 PM RE: Mercator Sailing: Course and Distance - Gene222 - 08-26-2018, 12:30 AM RE: Mercator Sailing: Course and Distance - Dieter - 08-26-2018, 07:18 AM RE: Mercator Sailing: Course and Distance - Albert Chan - 09-10-2022, 03:17 PM RE: Mercator Sailing: Course and Distance - Gene222 - 08-28-2018, 12:46 AM RE: Mercator Sailing: Course and Distance - Dieter - 08-28-2018, 08:53 AM RE: Mercator Sailing: Course and Distance - Dieter - 08-28-2018, 04:49 PM RE: Mercator Sailing: Course and Distance - Gene222 - 08-29-2018, 09:02 PM RE: Mercator Sailing: Course and Distance - Dieter - 08-30-2018, 05:49 AM RE: Mercator Sailing: Course and Distance - Gene222 - 08-30-2018, 11:59 PM RE: Mercator Sailing: Course and Distance - Gene222 - 08-31-2018, 02:15 AM RE: Mercator Sailing: Course and Distance - Dieter - 08-31-2018, 05:46 AM RE: Mercator Sailing: Course and Distance - Dieter - 09-01-2018, 05:51 AM RE: Mercator Sailing: Course and Distance - VadimV - 12-21-2022, 08:31 PM RE: Mercator Sailing: Course and Distance - Gene222 - 09-01-2018, 02:52 AM RE: Mercator Sailing: Course and Distance - Gene222 - 09-02-2018, 04:03 PM RE: Mercator Sailing: Course and Distance - Dieter - 09-02-2018, 06:27 PM RE: Mercator Sailing: Course and Distance - Gene222 - 09-03-2018, 10:10 PM RE: Mercator Sailing: Course and Distance - Dieter - 09-04-2018, 07:19 PM RE: Mercator Sailing: Course and Distance - Gene222 - 09-05-2018, 05:46 PM

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