var markergroups = {
	'fishery': {
		'game': [],
		'coarse': [],
		'coarse and game': []
	},
	'attraction': {
		'country park': [],
		'gallery': [],
		'garden': [],
		'historic building': [],
		'historic structure': [],
		'leisure attraction': [],
		'market': [],
		'museum': [],
		'nature reserve': [],
		'visitor centre': [],
		'watersports clubs': [],
		'waterway trust and societies': []
	},
	'service': {
		'boat hire':[],
		'boat sales': [],
		'boat timeshare': [],
		'boat trips': [],
		'cafe': [],
		'campsites': [],
		'canal boat holidays': [],
		'canoe clubs': [],
		'canoe hire': [],
		'community boat': [],
		'cottages and hotels': [],
		'cycle hire': [],
		'hotel boats': [],
		'moorings': [],
		'pubs and bars': [],
		'restaurant': [],
		'restaurant boat': []
	}, 
	'town': {
		'destination': [],
		'major town': [],
		'waterway town': []
	},
	'structure': {
		'aqueduct': [],
		'boat lift': [],
		'bridge':[],
		'bw office': [],
		'dock': [],
		'dry dock': [],
		'lock': [],
		'mooring': [],
		'slipway': [],
		'tunnel': [],
		'tunnel portal': [],
		'wharf': [],
		'weir': [],
		'winding hole': []
	}
};