Location conversion (math....) - SailNet Community
Captain Bob

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Location conversion (math....)

I have a device that gives me my location in degrees, but not the minutes and seconds. This is displayed as (example) 75.nnnnn. where I'd need to convert the decimal value nnnnn to minutes and seconds. If I sat down and had enough time I might figure it out, but figured this has "been done" already.

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GPS Latitude and Longitude Converter

Converting UTM to Latitude and Longitude (Or Vice Versa)

Converting Between Decimal Degrees, Degrees, Minutes and Seconds, and Radians

(dd + mm/60 +ss/3600) to Decimal degrees (dd.ff)
dd = whole degrees, mm = minutes, ss = seconds
dd.ff = dd + mm/60 + ss/3600
Example: 30 degrees 15 minutes 22 seconds = 30 + 15/60 + 22/3600 = 30.2561
Decimal degrees (dd.ff) to (dd + mm/60 +ss/3600)
For the reverse conversion, we want to convert dd.ff to dd mm ss. Here ff = the fractional part of a decimal degree.
mm = 60*ff
ss = 60*(fractional part of mm)
Use only the whole number part of mm in the final result.
30.2561 degrees = 30 degrees
.2561*60 = 15.366 minutes
.366 minutes = 22 seconds, so the final result is 30 degrees 15 minutes 22 seconds

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Last edited by jerryrlitton; 06-11-2011 at 12:26 PM.
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OK, I'll try.

Take the fractional degree .nnnnn degrees x 60 minutes/degree = xx.yyyyy

xx is the number of whole minutes, .yyyyy the factional minutes.

Take the factional minutes .yyyyy x 60 seconds/minute = ss.ffff

ss.ffff is the number of seconds.
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Take your D.ddddddddddd enter it into a scientific caculator and press the degree button and it will be change to degrees, minutes & seconds.

For example: enter 75.6667 into the caculator. Press the degree button and the screen should show 75d 40m 0.12s.

This way you don't have to go through any convoluted math.

If your device is a GPS; You can go into the GPS menus and change the readout from DDD.ddd to DDD.mmm or to DDD.mm.ss

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Last edited by Boasun; 06-11-2011 at 12:46 PM.
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Quote:
Originally Posted by Boasun View Post
Take your D.ddddddddddd enter it into a scientific caculator and press the degree button and it will be change to degrees, minutes & seconds.

For example: enter 75.6667 into the caculator. Press the degree button and the screen should show 75d 40m 0.12s.

This way you don't have to go through any convoluted math.
That all depends on the calculator. Many will do this conversion, but often with a different key sequence. Some "scientific calculators" won't do it at all (not many, but a few). And when using some calculators, one has to be careful that the result isn't in radians rather than degrees.

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Quote:
Originally Posted by SlowButSteady View Post
That all depends on the calculator. Many will do this conversion, but often with a different key sequence. Some "scientific calculators" won't do it at all (not many, but a few). And when using some calculators, one has to be careful that the result isn't in radians rather than degrees.
You just proved the theory that you have to be 10% smarter than the toys you are playing with.

My Casio fx-300MS isn't that fussy. Enter the number, tap equal and then the degree button... No problem what so ever.

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Or just do the math.

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Doing the math!

Thanks to all. Yeah, I'll probably re-program to display the "normal" results.
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