MODX GoogleMap TV from here - http://miragram.com/blog/2013/02/18/udobnyij-vvod-koordinat-google-maps-cherez-tv/

gmaps.class.php

<?php
/**
 * @package modx
 * @subpackage processors.element.tv.renders.mgr.input
 * 
 * core/model/modx/processors/element/tv/renders/mgr/input/gmaps.class.php
 */
class modTemplateVarInputRenderGmaps extends modTemplateVarInputRender {
	public function getTemplate() {
		return 'element/tv/renders/input/gmaps.tpl';
	}
}
return 'modTemplateVarInputRenderGmaps';

gmaps.tpl

<!-- 

manager/templates/default/element/tv/renders/input/gmaps.tpl

-->

<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=YourAPIKeyHere&sensor=false&language=ru"></script>
<style>

	#canvas {
		width: 100%;
		height: 400px;
	}

</style>
	<input id="tv{$tv->id}" name="tv{$tv->id}" type="text" class="textfield" value="{$tv->get('value')|escape}"{$style}tvtype="{$tv->type}"/>
<br/><br/>
<script type="text/javascript">
	// <![CDATA[
	{literal}
	Ext.onReady(function() {
		var fld = MODx.load({
		{/literal}
			xtype: 'textfield'
					,applyTo: 'tv{$tv->id}'
				,width: '99%'
				,enableKeyEvents: true
				,msgTarget: 'under'
				,allowBlank: {if $params.allowBlank == 1 || $params.allowBlank == 'true'}true{else}false{/if}
			{if $params.maxLength},maxLength: {$params.maxLength}{/if}
				{if $params.minLength},minLength: {$params.minLength}{/if}
					{literal}
				,listeners: { 'keydown': { fn:MODx.fireResourceFormChange, scope:this}}
				});
					Ext.getCmp('modx-panel-resource').getForm().add(fld);
					MODx.makeDroppable(fld);
				});
				{/literal}
	// ]]>
</script><div id="canvas"></div>
<script type="text/javascript">
	// configuration
	var myZoom = 12;
	var myMarkerIsDraggable = true;
	var myCoordsLenght = 6;
	var str = document.getElementById('tv{$tv->id}').value;
	if (str=='') {
		var defaultLat = 55.7512419;
		var defaultLng = 37.6184217;
	} else {
		var arr = str.split(",");
		var defaultLat = arr[0];
		var defaultLng = arr[1];
	}
	{literal}
	// creates the map
	// zooms
	// centers the map
	// sets the map’s type
	var map = new google.maps.Map(document.getElementById('canvas'), {
		zoom: myZoom,
		center: new google.maps.LatLng(defaultLat, defaultLng),
		mapTypeId: google.maps.MapTypeId.ROADMAP
	});// creates a draggable marker to the given coords
	var myMarker = new google.maps.Marker({
		position: new google.maps.LatLng(defaultLat, defaultLng),
		draggable: myMarkerIsDraggable
	});// adds a listener to the marker
	// gets the coords when drag event ends
	// then updates the input with the new coords
	google.maps.event.addListener(myMarker, 'dragend', function(evt){
		{/literal}
		
			document.getElementById('tv{$tv->id}').value = evt.latLng.lat().toFixed(myCoordsLenght) + "," + evt.latLng.lng().toFixed(myCoordsLenght);
			{literal}
		});// centers the map on markers coords
		map.setCenter(myMarker.position);// adds the marker on the map
		myMarker.setMap(map);

	if (navigator.geolocation && str === '') {
		navigator.geolocation.getCurrentPosition(function(position) {
			userCenter = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);
			map.setCenter(userCenter);
			myMarker.setPosition(userCenter);
		});
	}
</script>
{/literal}