Must have CSS:

.acf-map {
	width: 100%;
	height: 400px;
	border: #ccc solid 1px;
	margin: 20px 0;
}

Must Have Javascript:

(function($) {

/*
*  render_map
*
*  This function will render a Google Map onto the selected jQuery element
*
*  @type	function
*  @date	8/11/2013
*  @since	4.3.0
*
*  @param	$el (jQuery element)
*  @return	n/a
*/

function render_map( $el ) {

	// var
	var $markers = $el.find('.marker');

	// vars
	var args = {
		zoom		: 16,
		center		: new google.maps.LatLng(0, 0),
		mapTypeId	: google.maps.MapTypeId.ROADMAP
	};

	// create map	        	
	var map = new google.maps.Map( $el[0], args);

	// add a markers reference
	map.markers = [];

	// add markers
	$markers.each(function(){

    	add_marker( $(this), map );

	});

	// center map
	center_map( map );

}

/*
*  add_marker
*
*  This function will add a marker to the selected Google Map
*
*  @type	function
*  @date	8/11/2013
*  @since	4.3.0
*
*  @param	$marker (jQuery element)
*  @param	map (Google Map object)
*  @return	n/a
*/

function add_marker( $marker, map ) {

	// var
	var latlng = new google.maps.LatLng( $marker.attr('data-lat'), $marker.attr('data-lng') );

	// create marker
	var marker = new google.maps.Marker({
		position	: latlng,
		map			: map
	});

	// add to array
	map.markers.push( marker );

	// if marker contains HTML, add it to an infoWindow
	if( $marker.html() )
	{
		// create info window
		var infowindow = new google.maps.InfoWindow({
			content		: $marker.html()
		});

		// show info window when marker is clicked
		google.maps.event.addListener(marker, 'click', function() {

			infowindow.open( map, marker );

		});
	}

}

/*
*  center_map
*
*  This function will center the map, showing all markers attached to this map
*
*  @type	function
*  @date	8/11/2013
*  @since	4.3.0
*
*  @param	map (Google Map object)
*  @return	n/a
*/

function center_map( map ) {

	// vars
	var bounds = new google.maps.LatLngBounds();

	// loop through all markers and create bounds
	$.each( map.markers, function( i, marker ){

		var latlng = new google.maps.LatLng( marker.position.lat(), marker.position.lng() );

		bounds.extend( latlng );

	});

	// only 1 marker?
	if( map.markers.length == 1 )
	{
		// set center of map
	    map.setCenter( bounds.getCenter() );
	    map.setZoom( 16 );
	}
	else
	{
		// fit to bounds
		map.fitBounds( bounds );
	}

}

/*
*  document ready
*
*  This function will render each map when the document is ready (page has loaded)
*
*  @type	function
*  @date	8/11/2013
*  @since	5.0.0
*
*  @param	n/a
*  @return	n/a
*/

$(document).ready(function(){

	$('.acf-map').each(function(){

		render_map( $(this) );

	});

});

})(jQuery);

Must have link to Google Maps API:

<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>

Create your Advanced Custom Field, “locations”

It will return an array with, “lat” “lng” and “address”

You can create an example with a info window when you click the marker like this: (single marker type)

 <div class="googlemap">
   <?php 
	$location = get_field('locations');
		if( !empty($location) ): ?>
			<div class="acf-map">
				<div class="marker" data-lat="<?php echo $location['lat']; ?>" data-lng="<?php echo $location['lng']; ?>">
                <div class="markerinfo">
                <strong><?php echo $location['address']; ?></strong><br>
                	<a href="https://www.google.com/maps/search/<?php echo $location['address']; ?>">Get Directions</a>
                </div><!-- narker info -->
                </div><!-- marker -->
			</div><!-- acf map -->
		<?php endif; ?>
  </div><!-- google map -->