Web-UI: Speedup history loading

interactive.c

@@ -56,7 +56,7 @@
 static int convert_altitude(int ft)
 {
     if (Modes.metric)
-        return (ft / 3.2828);
+        return (ft * 0.3048);
     else
         return ft;
 }

public_html/formatter.js

@@ -41,7 +41,7 @@ function format_altitude_brief(alt, vr) {
 	}
 
 	if (Metric) {
-		alt_text = Math.round(alt / 3.2828) + NBSP; // Altitude to meters
+		alt_text = Math.round(alt * 0.3048) + NBSP; // Altitude to meters
 	} else {
 		alt_text = Math.round(alt) + NBSP;
 	}
@@ -59,7 +59,7 @@ function format_altitude_brief(alt, vr) {
 // alt in ft
 function _alt_to_unit(alt, m) {
 	if (m)
-		return Math.round(alt / 3.2828) + NBSP + "m";
+		return Math.round(alt * 0.3048) + NBSP + "m";
 	else
 		return Math.round(alt) + NBSP + "ft";
 }