DMS vs DD lat/long in F10 map - ED Forums
 


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Old 12-17-2019, 08:58 PM   #1
Chic
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Default DMS vs DD lat/long in F10 map

Not sure where to best post this query.
The Decimal-Degree data on the F10 map is 7 digits (43*15.345).
I thought the typical DD config = (43.1535), with the number of post decimal digits varying with desired degree of accuracy.
More importantly, I'm finding that when one converts the Degree-Minute-Second data from the F10 map using DD = degree + (minutes/60) + (seconds/3600), it doesn't correlate with the DD data indicated in the F10 map.
I suspect I'm missing something. Any thoughts on this appreciated.
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Old 12-18-2019, 02:56 AM   #2
tom_19d
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Hey Doc, I think the terminology here is just tripping you up a bit. DCS seems to handle the coordinates correctly, but it only outputs DMS and DDM (degrees decimal-minutes).

For example, I placed my cursor directly on the top of the “1” on runway 13 at Batumi. Without moving my mouse I recorded the DCS coordinates in the various formats.

DMS
N 41* 36’ 57.50” E 041* 35’ 26.21”

DDM
N 41* 36.958” E 041* 35.436”

To check this is correct we can take the seconds from the DMS and divide by 60

57.50 / 60 = .958 and 26.21 / 60 = .437

If we want to generate a DD we need to make the minutes from DDM into a fraction of a degree so we will divide the minutes by 60

36.958 / 60 = .616 and. 35.436 / 60 = .591

So DD
N 41.616* and E 041.591*
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Old 12-18-2019, 03:52 AM   #3
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Yup, did not recognize DDM. My Man.
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