GPS Data

[mrxxlphp]

Hi guys, does anyone know the formula to work out the heading from two sets of GSP data.

i.e.

// Location 1
$lat1 = 43.242202;
$lon1 = 6.595025;

// Location 2
$lat2 = 57.085103;
$lon2 = 9.282492;

Now if I am at location 1, what heading do I need to face to be pointing directly at location 2.

Thanks

Stuart

[dagon]

006°04′05″

[mrxxlphp]

Genius!