View Full Version : Converting GPS Coordinates

08-06-2009, 03:32 PM
Hi, new to the forum and might as well start with a question that I have been trying to get the answer for some time.
I have a Lowrance GPS that can display coords in various forms which are either, degrees pure decimal eg 25.124167, degrees, minutes and seconds eg 25-07'-27", or degrees, minutes and thousands eg 25-07.450.
I know how to convert these coords back and forth but heres the difficulty.
I have purchased a book of shipwrecks (with the intention of fishing some of them) and the coords are in degrees, minutes and hundreds of a second. How do I convert the coords to one of the above formats?. I have tried multiplying the last two digits i.e. the hundreds by 10 to convert it to thousands, but some of the wrecks end up being shown in a farmers field!!.

How should I convert these coords an example of them is N51-41.76, W04-57.50.

Any help would stop me going out of my mind.

Many thanks in anticipation Graeme:smarty:

08-14-2009, 11:19 AM
There are sixty minutes of arc in a degree, and sixty seconds of arc in a degree.

Therefore, a decimal ordinate (longitude or latitude, it doesn't matter) = (degrees) + (minutes of arc)/60 + (seconds of arc)/3600


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