Edit fiddle - JSFiddle - Code Playground

HTML

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<div id="map"></div>
<button onClick="runAllChainEvents();">Sign in</button>

JavaScript

Module

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var neighborhoods = [
    {lat: -36.862338, lng: 174.7425013},
    {lat: -36.867204, lng: 174.7692113},
    {lat: -36.848362, lng: 174.7426733},
    {lat: -36.845028, lng: 174.7748043},
    {lat: -36.862644, lng: 174.7340973},
    {lat: -36.862775, lng: 174.7836023}
];
var markers =[];
var map;
var dabblers = "https://maps.google.com/mapfiles/ms/micons/blue.png";
var yourLocation = "https://maps.google.com/mapfiles/ms/micons/red.png";
var myLocationIconArray = [];
var hasHappened = false;
var infoWindowContentString = '';
var dabblerInfoWindow = null;
var addInfowindow;
var distanceArray = [];
var defaultPos = {lat: -36.8527785, lng: 174.7617562};
var centerPos;
​
var dabblersArray = [
    {lat: -36.862338, lng: 174.7425013, type: 'sweet'},
    {lat: -36.867204, lng: 174.7692113, type: 'sweet'},
    {lat: -36.848362, lng: 174.7426733, type: 'sweet'},
    {lat: -36.845028, lng: 174.7748043, type: 'savoury'},
    {lat: -36.862644, lng: 174.7340973, type: 'savoury'},
    {lat: -36.862775, lng: 174.7836023, type: 'savoury'}
];
​
/* Initializes map with custom styles, centers location, 
   and defines Map UI */
function initMap() {
    var customMapType = new google.maps.StyledMapType([
        {
          stylers: [
            {hue: '#8c8c8c'},
            {visibility: 'simplified'}
          ]
        },
        {
          elementType: 'labels',
          stylers: [{visibility: 'off'}]
        },
        {
          elementType: 'landscape',
          stylers: [{color: '#e6e6e6'}]
        },
        {
          featureType: 'road',
          stylers: [{color: '#ffffff'}]
        },
        {
          featureType: 'road.highway.controlled_access',
          stylers: [{color: '#cccccc'}]
        },
        {
          featureType: 'road.arterial',
          stylers: [{color: '#cccccc'}]
        },
        {
          featureType: 'water',
          stylers: [
            {color: '#dce6e6'},
            {"lightness": -10},
            {"saturation": -30}
          ]
        },
        {
          featureType: 'poi',
          stylers: [{visibility: 'off'}]
        },
        {
          featureType: 'transit.line',
          stylers: [{visibility: 'off'}]
        }
    ], { name: 'Custom Style'
    });   
    var customMapTypeId = 'custom_style';
    map = new google.maps.Map(document.getElementById('map'), {
          center: { lat: -36.8527785, lng: 174.7617562}, // Auckland City coords
          zoom: 15,
          disableDefaultUI: true,
          zoomControl: false,
          mapTypeControl: false,
          scaleControl: false,
          fullscreenControl: false,
          streetViewControl: false,
          mapTypeControlOptions: {
            mapTypeIds: [google.maps.MapTypeId.ROADMAP, customMapTypeId]
          }
    });
    map.mapTypes.set(customMapTypeId, customMapType);
    map.setMapTypeId(customMapTypeId);
    map.setOptions({draggable: false, zoomControl: false,
    zoomControlOptions: {
              position: google.maps.ControlPosition.BOTTOM_CENTER
          },
    scrollwheel: false, disableDoubleClickZoom: true});
    drop();
}
​
/* Takes positions in neighborhoodsArray and runs each through 
   the addMarkerWithTimeout function */
function drop() {
  var delay = 800;
    for (var i = 0; i < neighborhoods.length; i++) {
      addMarkerWithTimeout(neighborhoods[i], i*200 + delay);
    }
}
​
/* Takes position (lat / long) and timeout parameters and converts 
   into Google Map Markers. Then adds to Google Map. */
function addMarkerWithTimeout(position, timeout) {
    window.setTimeout(function() {
      markers.push(new google.maps.Marker({
        position: position,
        map: map,
        animation: google.maps.Animation.DROP,
        icon: dabblers,
        draggable: false,
        clickable: false
      }));
    }, timeout);
}
​
/*  Clears original markers from map and sets relative arrays to [] */
function deleteMarkers() {
    for (var x = 0; x < markers.length; x++) {
      markers[x].setMap(null);
    }
    markers = [];
    neighborhoods = [];
}
​
/* Adds your location & infoWindow to map after signIn */   
function addMarker(location, addInfowindow) {
    var marker = new google.maps.Marker({
        position: location,
        map: map,
        animation: google.maps.Animation.DROP,
        icon: yourLocation,
        draggable: false,
        clickable: true
    });
    if (addInfowindow == null) {
        var myLocationInfowindow = new google.maps.InfoWindow({
          content: "Your location",
          disableAutoPan: false
        });
        myLocationInfowindow.open(map, marker);
        myLocationIconArray.push(marker);
    } else {
        var myLocationInfowindow = new google.maps.InfoWindow({
          content: infoWindowContentString,
          disableAutoPan: true
        });
        myLocationInfowindow.open(map, marker);
        myLocationIconArray.push(marker);
    }
}
​
/* Checks if Users browser / device is capable of Geolocation. If it is, gets current position */
function getUserLocation(onComplete) {  
    map.setOptions({draggable: true, zoomControl: true, scrollwheel: true, disableDoubleClickZoom: false});
​
    if (navigator.geolocation) {
        navigator.geolocation.getCurrentPosition(function(position) {
            centerPos = {
                lat: position.coords.latitude,
                lng: position.coords.longitude
            };
            map.setCenter(centerPos);
            addMarker(centerPos);
            onComplete();
        }, function() {
            handleLocationError(true, addInfowindow, map.getCenter());
        });
    } else {
        //Browser doesn't support Geolocation
        handleLocationError(false, addInfowindow, map.getCenter());
    }
}
​
/* Removes elements, and adds Dabblers to map */
function runAllChainEvents() {
    getUserLocation(addDabblerArrayToMap);
}
​
/* Handles error if Users browser / device is not capable of Geolocation
   lookup functionality. Places their location at centre of Auckland. */    
function handleLocationError(browserHasGeolocation, addInfowindow, defaultPos) {
    if (browserHasGeolocation) {
        infoWindowContentString = "Sorry, we can't get your location."; 
    } else {
        infoWindowContentString = "Your current browser does not support Geolocation.";
    }
    addInfowindow = new google.maps.InfoWindow({
          content: infoWindowContentString,
          disableAutoPan: true
        });
    map.setCenter(defaultPos);
    addMarker(defaultPos, addInfowindow);
    addDabblerArrayToMap(null);
}
​
/* Takes positions in dabblersArray and runs each through 
   the addMarkerWithTimeout function. Then calculates the 
   distance between user and dabblers.   */
function addDabblerArrayToMap(position1) {
    var distance;
    var dabblerLocation;
    deleteMarkers();
    position1 = centerPos;
​
    if (position1 == null) {
        for (var z = 0; z < dabblersArray.length; z++) {
            markers.push(new google.maps.Marker({
            position: { lat: dabblersArray[z].lat, lng: dabblersArray[z].lng},
            map: map,
            icon: dabblers,
            draggable: false,
            clickable: true,
            id: dabblersArray[z].type
            }));
        }
    } else {
        var usersPosition = new google.maps.LatLng(centerPos.lat, centerPos.lng);
​
        for (var y = 0; y < dabblersArray.length; y++) {    
            dabblerLocation = new google.maps.LatLng(dabblersArray[y].lat, dabblersArray[y].lng);
​
            distance = google.maps.geometry.spherical.computeDistanceBetween(usersPosition, dabblerLocation);
            distance = parseFloat(distance / 1000).toFixed(2);
            distanceArray.push(distance);
​
            dabblerInfoWindow = new google.maps.InfoWindow({
                content: distance + "km",
                disableAutoPan: true
            });
​
            markers.push(new google.maps.Marker({
            position: { lat: dabblersArray[y].lat, lng: dabblersArray[y].lng },
                map: map,
                icon: dabblers,
                draggable: false,
                clickable: true,
                id: dabblersArray[y].type
            }));
            dabblerInfoWindow.open(map, markers[y]);
        }
    // I shouldn't need to add this here, but have tried to set Center
    //    position manually again here to no avail also.
    // setTimeout(function() {
    map.setCenter(centerPos)
    //}, 5000);
    }
}
google.maps.event.addDomListener(window, "load", initMap);
​

CSS

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html,body {
  height: 100%;
}
#map {
   height: 100%;
}

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