Geolocation options, and speed/altitude etc

new_gist_file.js

// Determine my location asynchronously and display it in the specified element. 
function whereami(elt) {
// Pass this object as the 3rd argument to getCurrentPosition()
var options = {
// Set to true to get a higher accuracy reading (from GPS, for example) // if available. Note, however that this can affect battery life. 
enableHighAccuracy: false, // Approximate is okay: this is the default
// Set this property if a cached location is good enough.
// The default is 0, which forces location to be checked anew. 
maximumAge: 300000, // A fix from the last 5 minutes is okay
// How long are you willing to wait to get the location?
// The default is Infinity and getCurrentPosition() never times out 
timeout: 15000 // Don't take more than 15 seconds
};
if (navigator.geolocation) // Request position, if supported 
navigator.geolocation.getCurrentPosition(success, error, options);
else
elt.innerHTMl = "Geolocation not supported in this browser";
// This function will be invoked if geolocation fails
function error(e) {
// The error object has a numeric code and a text message. Code values: // 1: the user did not give permission to share his or her location
// 2: the browser was unable to determine the position
// 3: a timeout occurred
elt.innerHTML = "Geolocation error " + e.code + ": " + e.message;
}
// This function will be invoked if geolocation succeeds function success(pos) {
// These are the fields that we always get. Note that the timestamp // is in the outer object, not the inner, coords object.
var msg = "At " +
new Date(pos.timestamp).toLocaleString() + " you were within " + pos.coords.accuracy + " meters of latitude " + pos.coords.latitude + " longitude " +
pos.coords.longitude + ".";
// If our device returns altitude, add that information. 
if (pos.coords.altitude) {
msg += " You are " + pos.coords.altitude + " ± " + pos.coords.altitudeAccuracy + "meters above sea level.";
}
// if our device returns speed and heading, add that, too. 
if (pos.coords.speed) {
msg += " You are travelling at " + pos.coords.speed + "m/s on heading " + pos.coords.heading + ".";
}
elt.innerHTML = msg; // Display all the position information }
}