Version: Smart Feature Phone 2.5


The Geolocation method watchPosition() method is used to register a handler function that will be called automatically each time the position of the device changes. You can also, optionally, specify an error handling callback function.

This method returns a watch ID value that then can be used to unregister the handler by passing it to the Geolocation.clearWatch() method.


id = navigator.geolocation.watchPosition(success[, error[, options]])


  • success A callback function that takes a Position object as an input parameter.
  • error Optional An optional callback function that takes a PositionError object as an input parameter.
  • options Optional An optional PositionOptions object that provides configuration options for the location watch.


var id, target, options;
function success(pos) {
var crd = pos.coords;
if (target.latitude === crd.latitude && target.longitude === crd.longitude) {
console.log('Congratulations, you reached the target');
function error(err) {
console.warn('ERROR(' + err.code + '): ' + err.message);
target = {
latitude : 0,
longitude: 0
options = {
enableHighAccuracy: false,
timeout: 5000,
maximumAge: 0
id = navigator.geolocation.watchPosition(success, error, options);

If your application is running on KaiOS, please take a look at geolocation wake lock to keep your application getting position updates while in the background or screen off.