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  1. #1
    Join Date
    Sep 2009
    Location
    Solent
    Posts
    1,323

    Default Lattitude and longitude formats, an obvious observation

    This is all very obvious really, but I found it interesting. Reading the stuff about GPS rollover and checking your equipment I thought I would check mine, even though I think it is all too young to worry about. So two Garmin GPS 72 s and an E trek, plus my Lenovo tablet with Marine Navigator app. The Garmins all correlated but not at all with my tablet, although the tablet showed me to be exactly in the right place on the screen. It took me quite a while to twig that the tablet was using a different format (5 decimal places). I don't use the tablet for navigation that much and I'm not sure in normal circumstances you would use it for position that often, you just look at where it places you on the chart. So the exercise was a good reminder about formats. I hope in the unlikely event of a non DSC mayday I'd get the format right

    Just to show the difference (were anyone interested) 0 degrees57.608' W, is the same as 0.96013 W. Took me too long to feel happy about that!

  2. #2
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    18,625

    Default Re: Lattitude and longitude formats, an obvious observation

    We have plenty of posts on YBW over the years where posters have got confused between the different formats so the confusion certainly does happen in the "real" world.

    Richard

  3. #3
    Join Date
    Sep 2001
    Location
    Me - Zumerzet Boat - Wareham
    Posts
    11,953

    Default Re: Lattitude and longitude formats, an obvious observation

    If you use an app like Mad Mutt Marine or Saildroid you get the readout in 'standard' format.
    MontyMariner.co.uk
    Facilitated by AWESEM WP Agency

  4. #4
    Join Date
    Jun 2017
    Posts
    725

    Default Re: Lattitude and longitude formats, an obvious observation

    Quote Originally Posted by FairweatherDave View Post
    This is all very obvious really, but I found it interesting. Reading the stuff about GPS rollover and checking your equipment I thought I would check mine, even though I think it is all too young to worry about. So two Garmin GPS 72 s and an E trek, plus my Lenovo tablet with Marine Navigator app. The Garmins all correlated but not at all with my tablet, although the tablet showed me to be exactly in the right place on the screen. It took me quite a while to twig that the tablet was using a different format (5 decimal places). I don't use the tablet for navigation that much and I'm not sure in normal circumstances you would use it for position that often, you just look at where it places you on the chart. So the exercise was a good reminder about formats. I hope in the unlikely event of a non DSC mayday I'd get the format right

    Just to show the difference (were anyone interested) 0 degrees57.608' W, is the same as 0.96013 W. Took me too long to feel happy about that!
    A good reminder to always check units, scales etc!

    Would it be less confusing if the programmer avoided decimals of a minute and displayed the fraction as seconds? Perhaps not!

  5. #5
    Join Date
    Jun 2011
    Location
    Berkshire, UK
    Posts
    2,654

    Default Re: Lattitude and longitude formats, an obvious observation

    Quote Originally Posted by penberth3 View Post
    Would it be less confusing if the programmer avoided decimals of a minute and displayed the fraction as seconds? Perhaps not!
    Aren't paper charts marked up with decimal minutes these days?

    Mike.

  6. #6
    Join Date
    Sep 2016
    Location
    London / Suffolk
    Posts
    733

    Default Re: Lattitude and longitude formats, an obvious observation

    Quote Originally Posted by mjcoon View Post
    Aren't paper charts marked up with decimal minutes these days?

    Mike.
    Yes
    Someone more informed will come along any minute

  7. #7
    Join Date
    Sep 2009
    Location
    Solent
    Posts
    1,323

    Default Re: Lattitude and longitude formats, an obvious observation

    Okay. To standardise this conversation
    Garmin gives three options on my handhelds
    1. hddd.ddddd degrees
    2 hddd degrees mm.mmm'
    3 hddd degrees mm'ss.s"

    (sorry, don't know how to show the degrees symbol)
    To which option are you referring with "decimal minutes" on the paper charts?

    (Apols for the clumsy English, just trying for clarity, not trying to sound confrontational!)

  8. #8
    Join Date
    Aug 2004
    Location
    Fishguard, Pembs
    Posts
    83

    Default Re: Lattitude and longitude formats, an obvious observation

    The excellent Marine Navigator app lets you choose the lat/long format, just go to Settings and it's the first option.

  9. #9
    Join Date
    Sep 2009
    Location
    Solent
    Posts
    1,323

    Default Re: Lattitude and longitude formats, an obvious observation

    Quote Originally Posted by FairweatherDave View Post
    Okay. To standardise this conversation
    Garmin gives three options on my handhelds
    1. hddd.ddddd degrees
    2 hddd degrees mm.mmm'
    3 hddd degrees mm'ss.s"

    (sorry, don't know how to show the degrees symbol)
    To which option are you referring with "decimal minutes" on the paper charts?

    (Apols for the clumsy English, just trying for clarity, not trying to sound confrontational!)
    I'm learning
    Option 1. is decimal degrees
    Option 2. is decimal minutes
    Option 3 is sexagesimal

    My GPS were set to option 2 and my tablet to option1. As stated, I haven't used my tablet much with Marine Navigator, even less to look at lat and long. But I will set it to option2

  10. #10
    Join Date
    Feb 2005
    Location
    Guernsey
    Posts
    3,389

    Default Re: Lattitude and longitude formats, an obvious observation

    Quote Originally Posted by FairweatherDave View Post
    Okay. To standardise this conversation
    Garmin gives three options on my handhelds
    1. hddd.ddddd degrees
    2 hddd degrees mm.mmm'
    3 hddd degrees mm'ss.s"

    (sorry, don't know how to show the degrees symbol)
    To which option are you referring with "decimal minutes" on the paper charts?

    (Apols for the clumsy English, just trying for clarity, not trying to sound confrontational!)
    If you want to do something like use a Special Character when posting on this forum, compose your post in your Word Processor and copy in to your post, like this:

    Okay. To standardise this conversation
    Garmin gives three options on my handhelds
    1.*hddd.ddddd º
    2 hddd º*mm.mmm'
    3 hddd º mm'ss.s"
    On the internet no one knows you are a donkey.

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