Improve debug messages

utils/lib.js

@@ -120,7 +120,10 @@ function distanceFrom(locationA, locationB) {
     let r = 6371000;
     
     // calculate the result
-    return `${(c * r).toFixed()} m`;
+    let result = `${(c * r).toFixed()} m`
+    
+    console.debug('Result is ' + result);
+    return result;
 }