Google Maps API v3 adding an InfoWindow to each marker

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You are having a very common closure problem in the for in loop:

Variables enclosed in a closure share the same single environment, so by the time the click callback from the addListener is called, the loop will have run its course and the info variable will be left pointing to the last object, which happens to be the last InfoWindow created.

In this case, one easy way to solve this problem would be to augment your Marker object with the InfoWindow:

var marker = new google.maps.Marker({map: map, position: point, clickable: true});

marker.info = new google.maps.InfoWindow({
  content: '<b>Speed:</b> ' + values.inst + ' knots'
});

google.maps.event.addListener(marker, 'click', function() {
  marker.info.open(map, marker);
});

This can be quite a tricky topic, if you are not familiar with how closures work. You may to check out the following Mozilla article for a brief introduction:

Also keep in mind, that the v3 API allows multiple InfoWindows on the map. If you intend to have just one InfoWindow visible at the time, you should instead use a single InfoWindow object, and then open it and change its content whenever the marker is clicked (Source).

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