To get information about any item on a graphic layer by its coordinates, use the request:

http://{host}/avl_hittest_pos?sid=<text>&lat=<double>&lon=<double>&scale=<uint>&
radius=<double>&layerName=<text>

For markers (POIs): to get marker information please define POI icon coordinates and any radius.

For geofences and circle-shaped markers (POIs): to get such object information please define coordinates within its shape and any radius.

For messages:

{
	"type":"msg",		/* result type */
	"currMsg":{		/* current message */
		...
	},
	"prevMsg":{		/* previous message */
		...
	},
	"msgIndex":<uint>,	/* index of current message */
	"unitId":<long>,	/* unit ID */
	"mileage":<double>,	/* mileage */
	"layerName":<text>	/* layer name */
}

Formats of current and previous messages are described in the chapter Data format: Message with data.

For markers:

{
	"type":"marker",	/* result type */
	"lat":<double>,		/* latitude */
	"lon":<double>,		/* longitude */
	"info":[{}],		/* information about the marker: depends on marker type */		
	"layerName":<text>,	/* layer name */
	"marker":<text>		/* additional information about the marker if exists */
}

For geofences:

{
	"type":"shape",		/* result type */
	"lat":<double>,		/* latitude */
	"lon":<double>,		/* longitude */
	"layerName":<text>,	/* layer name */
	"shape":<text>		/* information about the geofence, for example name */
}