[QRA Library] Fixes #1117. This fixes bearing calculation. Distance was not calculcated if the locator was directly to the north or south of your own locator.

application/libraries/Qra.php

@@ -72,21 +72,10 @@ cos(deg2rad($theta));
 }
 
 function bearing($lat1, $lon1, $lat2, $lon2, $unit = 'M') {
-  if (round($lon1, 1) == round($lon2, 1)) {
-	if ($lat1 < $lat2) {
-	  $bearing = 0;
-	} else {
-	  $bearing = 180;
-	}
-  } else {
   $dist = distance($lat1, $lon1, $lat2, $lon2, $unit);
-	$arad = acos((sin(deg2rad($lat2)) - sin(deg2rad($lat1)) * cos(deg2rad($dist / 60))) / (sin(deg2rad($dist
-/ 60)) * cos(deg2rad($lat1))));
-	$bearing = $arad * 180 / pi();
-	if (sin(deg2rad($lon2 - $lon1)) < 0) {
-	  $bearing = 360 - $bearing;
-	}
-  }
+  $dist = round($dist, 0);
+
+  $bearing = get_bearing($lat1, $lon1, $lat2, $lon2);
 
   $dirs = array("N","E","S","W");
 
@@ -118,13 +107,17 @@ $var_dist = "";
   return round($bearing, 0)."&#186; ".$dir." ".$var_dist;
 }
 
+function get_bearing($lat1, $lon1, $lat2, $lon2) {
+	return (rad2deg(atan2(sin(deg2rad($lon2) - deg2rad($lon1)) * cos(deg2rad($lat2)), cos(deg2rad($lat1)) * sin(deg2rad($lat2)) - sin(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($lon2) - deg2rad($lon1)))) + 360) % 360;
+}
+
 function qra2latlong($strQRA)
 
 {
 		if (strlen($strQRA) %2 == 0) {
 			$strQRA = strtoupper($strQRA);
 			if (strlen($strQRA) == 4)  $strQRA .= "MM";
-			if (!preg_match('/^[A-Z]{2}[0-9]{2}[A-Z]{2}$/',$strQRA)) return false;
+			if (!preg_match('/^[A-R]{2}[0-9]{2}[A-X]{2}$/',$strQRA)) return false;
 			list($a,$b,$c,$d,$e,$f) = str_split($strQRA,1);
 			$a = ord($a) - ord('A');
 			$b = ord($b) - ord('A');