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I think your best bet is going to be downloading GIS data for populated places and coastlines (Natural Earth is an oft-recommended source) and performing a proximity analysis using GIS software to exclude all places except those matching some criteria, e.g. within 10 miles of a coastline. Bear in mind the world is a big place, and the coastlines are very ...


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There is no simple and accurate way to do it because ellipsoid. conversion to meters varies depending latitude. See : Length of a degree: where do the terms in this formula come from? one way to make it very simple (but not very accurate) is use table from http://en.wikipedia.org/wiki/Decimal_degrees. use 0.001 degrees and trigonometry to solve points


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You might be interested in Traccar which does exactly what you are looking for. Plus it is open source. Plus it is already a web-server. Plus you can install it on Amazon Ec2 and link the database with Amazon RDS service.



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