lon/lat deg min vs. decimal - SailNet Community

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  #1  
Old 06-20-2013
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lon/lat deg min vs. decimal

Maybe I am just old school but I REALLY dislike the increasing use of decimal based lon/lat coordinates. Am I just an old curmudgeon or totally valid in this belief. I have found a converter website, but what a pain. My plotter exports the waypoints in decimal, ugh! Makes me turn purple!

Who started this bad habit anyway?

lon=""-122.47994022"" lat=""47.61065114"" >"
-122° 28' 47.7834" -47° 36' 38.343"
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Old 06-20-2013
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Re: lon/lat deg min vs. decimal

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Originally Posted by kellysails View Post
Maybe I am just old school but I REALLY dislike the increasing use of decimal based lon/lat coordinates. Am I just an old curmudgeon or totally valid in this belief. I have found a converter website, but what a pain. My plotter exports the waypoints in decimal, ugh! Makes me turn purple!

Who started this bad habit anyway?

lon=""-122.47994022"" lat=""47.61065114"" >"
-122° 28' 47.7834" -47° 36' 38.343"
Your plotter should have a programable choice between these methods of read out.
What type of plotter is it?
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Re: lon/lat deg min vs. decimal

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Originally Posted by Dog Ship View Post
Your plotter should have a programable choice between these methods of read out.
What type of plotter is it?
Simrad NSS12. I need to play with it some more and maybe I can work around it. The other options seemed to have some type of binary output, strange. I think this is gpx output if I remember right. I know Google Earth uses decimal format.
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Old 06-20-2013
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Re: lon/lat deg min vs. decimal

With eight digits after the decimal you know where you are to within an eighth of an inch!
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Re: lon/lat deg min vs. decimal

Nice plotter and it does have the abiity to read in degrees, you'll just have to mess about with it a bit.
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Re: lon/lat deg min vs. decimal

The plotter itself is all in deg mm sec, this issue is with the export tool. I think by definition, GPX format seems to be decimal oriented. There is one other export format that I have not tried yet, northstar.dat. Likely another binary format output though.

My question gets back to why did they create this stupid decimal methodology, errr. ?? Landlubbers messin' in our kitchen?
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Re: lon/lat deg min vs. decimal

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Originally Posted by Minnesail View Post
With eight digits after the decimal you know where you are to within an eighth of an inch!
Latitude or Longitude??
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Old 06-20-2013
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Re: lon/lat deg min vs. decimal

I prefer the decimal system, mostly because that's what I learned in college and while I was on the ship. It would be nice if there was one standard. I wouldn't mind using Degrees/Minutes/Seconds if that was all I had to know.
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Re: lon/lat deg min vs. decimal

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Originally Posted by happy_sailor View Post
I prefer the decimal system, mostly because that's what I learned in college and while I was on the ship. It would be nice if there was one standard. I wouldn't mind using Degrees/Minutes/Seconds if that was all I had to know.
So how do you plot/record position fixes on a paper chart with a decimal system?
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Re: lon/lat deg min vs. decimal

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Originally Posted by kellysails View Post
The plotter itself is all in deg mm sec, this issue is with the export tool.

...

My question gets back to why did they create this stupid decimal methodology, errr. ?? Landlubbers messin' in our kitchen?
Programmers messin' in your kitchen!

If it's part of an export tool, that makes sense to me. Internally the software isn't going to keeping separate variables for degrees, minutes, and seconds. It's just going to use one big number. It might convert it to minutes to show you on the screen, but inside it's just one number.

Same with dates and times. Microsoft rather arbitrarily set 0 to be midnight on December 30, 1899. So 0.5 would be noon of the same day, 2.5 would be noon of January 1, 1900. Right now, in Central time, it's 41445.55.
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