Distance tooltips for Google Maps

Show distance and position of markers that don't fit into current viewport of a map. Has no dependeces beyond Google Maps API.

Example:

var map = new google.maps.Map(document.getElementById("map-canvas")),
    position = new google.maps.LatLng(55.730196, 37.602141),
    marker = new google.maps.Marker({ position: position }),
    distanceOverlay = new DistanceOverlay({ position: position });

distanceOverlay.setMap(map);
marker.setMap(map);

This will create new Google maps instance and add regular marker and distance overlay. When marker is not in view port overlay will be shown.

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