Try it out using your overlay and the following map...
Click on the map to get a pdf file containing this exercise.
Your GPS unit reads...
10 S 0294324
3925702
Plot your position on the map.
What would that be in 100m abbreviated format?
Locate the following on the map...
943 265
948 264
9375 2702
Report the positions of the following symbols in 100m abbreviated format...