So far I have my iphone app getting the users current location and displaying it on the map.

Titanium.Geolocation.accuracy = Titanium.Geolocation.ACCURACY_BEST;

//
//  SET DISTANCE FILTER.  THIS DICTATES HOW OFTEN AN EVENT FIRES BASED ON THE DISTANCE THE DEVICE MOVES
//  THIS VALUE IS IN METERS
//
Titanium.Geolocation.distanceFilter = 10;

// SET GEO Reason
Ti.Geolocation.purpose = "Recieve User Location";

 var win = Titanium.UI.currentWindow;

//
// GET CURRENT POSITION - THIS FIRES ONCE
//
Titanium.Geolocation.getCurrentPosition(function(e)
{
    if (e.error)
    {
        alert('Cannot get your current location');
        return;
    }

    var longitude = e.coords.longitude;
    var latitude = e.coords.latitude;
    var altitude = e.coords.altitude;
    var heading = e.coords.heading;
    var accuracy = e.coords.accuracy;
    var speed = e.coords.speed;
    var timestamp = e.coords.timestamp;
    var altitudeAccuracy = e.coords.altitudeAccuracy;

    //
    //CREATE MAP VIEW
    //
    var mapview = Titanium.Map.createView({
        mapType: Titanium.Map.STANDARD_TYPE,
        region: {latitude: latitude, longitude: longitude, latitudeDelta:0.01, longitudeDelta:0.01},
        animate:true,
        regionFit:true,
        userLocation:true,

    });

    win.add(mapview);


});

My end goal is to have a start and stop button. User presses start walks so far, hits stop, and I output the distance traveled, speed etc. I can't seem to find much about doing something like this and the documentation on maps is a bit limited to finding positions, and dropping pins. An ideas?