Algolia and google filter results based on user position

Hi I am using Google maps alongside algolia where I have an index ‘locations’ with ‘lat’ and ‘lng’.

I am getting user location and watching position, I am also displaying markers from database based on lng and lat however I want to add a bit to it:

So I have followed that link:

https://www.algolia.com/doc/guides/geo-search/geo-search-overview/

And came up with:

$(document).ready(function() {
var map;
function initializeMap(){
    map = new google.maps.Map(document.getElementById('map_canvas'), {
        zoom: 19,
        mapTypeId: google.maps.MapTypeId.ROADMAP
    });
}
function locError(error) {
// the current position could not be located
    alert("The current position could not be found!");
}
function setCurrentPosition(position) {
    currentPositionMarker = new google.maps.Marker({
        map: map,
        position: new google.maps.LatLng(
            position.coords.latitude,
            position.coords.longitude
        ),
        title: "Current Position"
    });
    map.panTo(new google.maps.LatLng(
        position.coords.latitude,
        position.coords.longitude
    ));
}
var latitude = position.coords.latitude;
var longitude = position.coords.longitude;
console.log(latitude);
console.log(longitude);
function displayAndWatch(position) {
    // set current position
    setCurrentPosition(position);
    // watch position
    watchCurrentPosition(position);
    console.log(position);
}
function watchCurrentPosition(position) {
    var positionTimer = navigator.geolocation.watchPosition(
        function (position) {
            setMarkerPosition(
            currentPositionMarker,
            position,
        )
    });
}
function setMarkerPosition(marker, position) {
    marker.setPosition(
        new google.maps.LatLng(
            position.coords.latitude,
            position.coords.longitude)
    );
}
function initLocationProcedure() {
    initializeMap();
    if (navigator.geolocation) {
        navigator.geolocation.getCurrentPosition(displayAndWatch, locError);
        }else{
            alert("Your browser does not support the Geolocation API");
    }
}

$(document).ready(function() {
    initLocationProcedure();
});
var APPLICATION_ID = '75RQSC1OHE';
var SEARCH_ONLY_API_KEY = 'f2f1e9bba4d7390fc61523a04685cf12';
var INDEX_NAME = 'locations';
var PARAMS = { hitsPerPage: 100 };
// Client + Helper initialization
var algolia = algoliasearch(APPLICATION_ID, SEARCH_ONLY_API_KEY);
var algoliaHelper = algoliasearchHelper(algolia, INDEX_NAME, PARAMS);

// Map initialization
var markers = [];
//alert("heelo");
var fitMapToMarkersAutomatically = true;
algoliaHelper.on('result', function(content) {
    renderHits(content);
  var i;
  // Add the markers to the map
  for (i = 0; i < content.hits.length; ++i) {
    var hit = content.hits[i];
    console.log(hit)
    var marker = new google.maps.Marker({
      position: {lat: hit.longitude, lng: hit.latitude},
      map: map,
      title: hit.slug
    });
    

    markers.push(marker);
  }
  // Automatically fit the map zoom and position to see the markers
  if (fitMapToMarkersAutomatically) {
    var mapBounds = new google.maps.LatLngBounds();
    for (i = 0; i < markers.length; i++) {
      mapBounds.extend(markers[i].getPosition());
    }
    map.fitBounds(mapBounds);
  }

});
function renderHits(content) {
  $('#container').html(JSON.stringify(content, null, 2));
}
algoliaHelper.setQueryParameter('aroundRadius', 5000).search(); // 5km Radius

});

However there are few problems with this that I don’t know how to tackle:

  1. When user is moving, it doesn’t center the map on the marker.
  2. At this moment marker jumps between location when user moves, I would like for the marker to dynamically move on the map when user moves.
  3. I want to use algolia to dynamically set markers, so I want to show markers with 5km radius from user location, and dynamically add or remove markers that are outside it. But around radius returns nothing, if I do algoliaHelper.search(); I get all results