Determine the location of the mobile devices in latitude and longitude coordinates. Calculate distances and directions between locations. Use some simple database files with location information.
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Use the Geolocation API to find your own place in the world. Link to Google Maps.
Use a simple text file database to lookup in which country a specific IP is located.
Use a simple text file database to lookup cities close to your location.
Calculate the times at which the sun rises and sets for today, using the location of the user and the current date.
Send your own location to the server and display the location of all others that have visited the same web application previously.
Use watchPosition to retrieve continuous information about the location. Pick a predetermined location and calculate at what time the user should arrive at that location, using the previous movement and speed as an estimation.