Hi

With long/lat there are two way of displaying the value Degrees Minutes & Seconds or Degrees && Minutes with decimal:

<b>Longitude: 3° 53' 9.27" W
Latitude: 51° 44' 23.1" N</b>

or

<b>Longitude: 3° 53.1545' W
Latitude: 51° 44.385' N</b>

These both represent the same location. When entreing the info you need to either match the format to make it easy by changing the settings on the GPS or convert them to the format that your GPS is set up for.

To convert the second to the first multiply the decimal part by 60 e.g. 0.385 x 60 = 23.1
To go the other way divide the seconds by 60 e.g. 9.27 / 60 = .1545

You are actually best off setting your GPS to use the UK National Grid. Then you can enter the grid refs you find on the web. These are displayed more often than the long/lat reading, although they are becoming more common. Using the National Grid also allows you to get the OS map out and double check that it is at least close!

Take the grid ref for Carn LLechart -> SN698063

To enter this into a GPS you need to convert it into a 10 figure reading SN 69800 06300 . This grid ref should give you an accuracy of 100m, but it is only as accurate as the person that read the map if that's where it came from.

I may enable the code to convert UK grid refs to long lat on megalithomania. It is all there, so it wouldn't take long. As usual the main problem is time!