Added unit information to qra.php library

application/libraries/Qra.php

@@ -20,6 +20,15 @@ class Qra {
 	}
 }
 
+
+/*
+	Info: Distance Function
+
+	M = Miles
+	K = Kilometers
+	N = Nautical Miles
+*/
+
 function distance($lat1, $lon1, $lat2, $lon2, $unit = 'M') {
   $theta = $lon1 - $lon2;
   $dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) *