title: Storing and Querying GPS Coordinates Effectively
body: <p>I want to create a large database of GPS coordinates that can be queried by saying "Return all coordinates that are within 'n' metres of [this coordinate]".</p>
  
  <p>I need it to be as efficient as possible so looping through all the coordinates in the database and calculating whether a coordinate is within 'n' metres wouldn't be a desired solution.</p>
  
  <p>Is there an easier solution?</p>
  
  <p>Thanks</p>