Speed Time Distance Ruler (6 inch) Blundell Harling 1500000 Locations within this MapGingerah Locations within this MapGingerah Locations within this MapAlcoora Creek Alcoora Spring Andersons Saddle Battle Creek Boat Hill Bulinburra Knobs Burnt Well Bore Charley Springs Dam Christmas Dam Coolibah Dam Craigie Dam Dinner Creek Georges Muddle Dam Gumhole Creek Halfway Dam Heifer Waterhole Kelly Creek Kelly Creek Bore Malvina Creek Mc Cullock Creek Mc Guinness Bore Melon Waterhole Mistake Bore Mithaka Waterhole Mount Pozieres Mount Reinecke Mulga Creek Nathan Dam Nathan Hill No 7 Bore No 8 Dam Nora Gap Nora Waterhole Old Marqua Bore Peendenmurra Creek Pettigrew Creek Thipanama Waterhole Toko Range Umberumbera Waterhole Warka Warka Creek Mount Poziers McGuinness Bore Dingo Spring Eurtherin Spring Number Eight Dam Little Well Spring Aroota Well Craigie Creek Calculates the third variable given the other two (distance covered A must have tool for every professional mariner