To make the eruv map, someone had to enter all the individual points of the eruv boundary. That someone was Mickey Ariel (thanks!). To make it possible, I wrote a simple web application that contains a Google map and placs a marker at every mouse click. Each marker has a number, and the list of each marker's latitude and longitude is inserted at the end of the page. The markers can be dragged to new locations, and the boundary is drawn between the markers. Clicking a marker brings up a small callout window where notes can be added, the marker can be deleted and it can be renumbered (to move a marker between markers 4 and 5, change its number to 4.5. When you hit
Update, the list will be renumbered appropriately.
The tool can be used anytime you need the latitude/longitude for any route. Enjoy! 
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