Update user location

[promistrio]

How to update user location. In my situation it's not working

<template>
    <Page class="page">
        <ActionBar class="action-bar" title="Карта">
        <NavigationButton text="Go Back" android.systemIcon="ic_menu_back" @tap="$router.push('/home')"/>
        </ActionBar>
        <StackLayout>

        <Button class="btn btn-primary" @tap="addMarker">Добавить устройство</Button>
        
                <Mapbox
                    accessToken=""
                    latitude="46.2"
                    longitude="39.93"
                    mapStyle="streets"
                    zoomLevel="10"
                    showUserLocation="true"
                    disableZoom="false"
                    disableRotation="true"
                    disableScroll="false"
                    disableTilt="false"
                    ref="map"
                    @mapReady="onMapReady($event)">
                </Mapbox>
        </StackLayout>
    </Page>
</template>

<script>
    import Vue from 'nativescript-vue';
    import * as utils from "utils/utils";
    import * as dialogs from "ui/dialogs"

    Vue.registerElement("Mapbox", () => require("nativescript-mapbox").MapboxView)
    //import mapbox from 'nativescript-mapbox';
    //var mapbox = require("nativescript-mapbox");

    //const geoLocation = require("nativescript-geolocation");

    /*    geoLocation.isEnabled().then(enabled => {
            if (!enabled) {
                geoLocation
                    .enableLocationRequest()
                    .then(() => this.showLocation());
            } else {
             //   this.showLocation();
            }
        });*/

    export default {
        data () {
            return { };
        },
        methods: {
            addMarker(){
                var locations;
                locations = this.$refs.map.nativeView.getUserLocation().then(
                      function(userLocation) {
                          userLat = userLocation.location.lat;
                          userLon = userLocation.location.lng;

                          /*dialogs.alert("Широта и долгота").then(()=> {
                              //console.log("Широта и долгота есть:) "+ userLocation.location.lat + " " + userLocation.location.lng);  
                          });*/
                          

                          //console.log("Current user speed: " +  userLocation.speed);
                      }
                  )

                this.$refs.map.nativeView.addMarkers([
                {
                      lat: 46,
                      lng: 40,
                      title: 'One-line title here',
                      subtitle: 'Really really nice location',
                      selected: true, // makes the callout show immediately when the marker is added (note: only 1 marker can be selected at a time)
                      onCalloutTap: function(){console.log("'Nice location' marker callout tapped");}
                  }]
                );
              
             },
            onMapReady(args) {
                /*args.map.addMarkers([
                    {
                        lat: 37.7397,
                        lng: -121.4252,
                        title: "Tracy, CA",
                        subtitle: "Home of The Polyglot Developer!",
                        onCalloutTap: () => {
                            utils.openUrl("https://www.thepolyglotdeveloper.com");
                        }
                    }
                ]);*/

                args.map.trackUser({
                    mode: "FOLLOW_WITH_COURSE", // "NONE" | "FOLLOW" | "FOLLOW_WITH_HEADING" | "FOLLOW_WITH_COURSE"
                    animated: true
                });
            }
        }
    };
</script>

<style scoped></style>

Don't forget about mapbox token