controller.js

function openCheckInScreen() {

	if (geolocation.hasPermissions()) {


		location.getDeviceLocation({
			callback: getDeviceCallback
		});


	} else {
		geolocation.requestPermissions(function(result) {
			if (result) {
				location.getDeviceLocation({
					callback: getDeviceCallback
				});
			}
		});
	}
}

function getDeviceCallback(e) {
	var dist = App.location.distance(e.coords.latitude, e.coords.longitude, facilityLatitude, facilityLongitude);

	Ti.API.info('User Lat: ' + e.coords.latitude + ', User Long: ' + e.coords.longitude + ', Facility Lat: ' + facilityLatitude + ', Facility Long: ' + facilityLongitude);
	Ti.API.info('The distance is ' + dist + ', Mobile check in range is ' + mobileCheckInRange);

	if (dist < mobileCheckInRange) {

		App.openScreen('checkin/rep_checkin')

	} else {
		App.alert({
			title: 'Error',
			message: 'To check in, you must be approximately 100 yards from ' + $.l_hospital_name.getText() + '. Please move closer to the facility and/or try again in 3 minutes.'
		});
	}
}