It is plain to see that the use of Lat. Lon. may be beneficial in global navigation, but somewhat hard for bushwalkers to understand and accurately use. Many countries around the world have developed a better way to project the 3D image of the world onto a 2D piece of paper. It is printed on most maps even if it is not the primary grid. Lines of latitude go around the world parallel to the equator.
Lines of longitude go from pole to pole.
On a map, latitude lines are horizontal and longitude lines are vertical. The World is divided into the Northern and Southern Hemispheres. There are 360 degrees around the world and for each degree, there are 60 minutes and in each minute 60 seconds. Longitude Lines run from pole to pole. Nearly all Australian maps show UTM projection and its associated grid which is a favored grid to use when bushwalking.