Portland Navigation Protraction 250mm Blundell Harling png 7 Bore Baroona Springs Bergin 7 Bore Baroona Springs Bergin Boatman Bore Boatman Waterhole Bonna Vonna Boorte Bore Brown Brumby Lake Cassillis Charlotte Vale Well Cheverel Claverton Clifton Colley Coongoola Coongoola Bore Deep Creek Dingo Lake Doobibla Duck Ponds Ecclestone Elverston Elverston Bore Fighting Creek Geelong Gibsons Tank Gilgie Gilgies Goonery Goora Creek Government Tank Hesperia Inside Creek Jack Lakes Water Facility Juanbong Koonghan Kubill Kudnapper Creek Kungul Lands Tank Water Facility Langboyd Leeds Tank Water Facility Little Creek Mount Lookout McDougall Merrigin Middle Creek Mirrabooka Murweh Murweh Waterhole Nargoon Nemunmulla Nemunmulla Creek Nineteen Mile Creek No 5 Well Old Merriwarri Well Progress Bore Turner Bridge Webbs Bore Wifellacoothra Well Wockinginna Well Wonberinganna Well Yule Bridge Yule River Pumping Station Ah Fats Well Cadjewarrina Well Gingini Well Bendys Well Coondimidinir Pool Coonagoorina Pool Malaughans Well Old Merriwarra Well Kannanar Pool Douglas type square pattern navigational protractor Can also be used as a simple parallel rule and plotter