1. 1: Parts of a compass 2: Magnetic Variation 3: GMA (Grid, Magnetic, Actual) 4: How to convert between magnetic & grid 5: World magnetic zones COMPASSES

4. 2010 Current Year -1973 Last known correct declination year = 37 Total 37 X.05 (mills conversion) = 1.85 Degrees 3.08 Last known correct declination (variation) + 1.85 = 4.93 Degrees grid to magnetic West ● MUNDARING WEIR Latitude: 31° 56' 60" S Longitude: 116° 10' 0" E Magnetic declination: 1° 25' WEST(4.78125 degrees) Declination is NEGATIVE http://www.magnetic-declination.com/http://www.magnetic-declination.com/#

5. GMA GRID – MAGNETIC - ACTUAL

6. Grid Magnetic Actual Easterly Variation 4 o 50 o Magnetic baring of 50 degrees converted to grid baring 50 + 4 = 54 degrees (grid) Grid baring of 50 degrees converted to magnetic baring 50 – 4 = 46 degrees (magnetic)

7. Grid Magnetic Actual Westerly Variation 15 o 50 o Magnetic baring of 50 degrees converted to grid baring 50 - 15 = 65 degrees (grid) Grid baring of 50 degrees converted to magnetic baring 50 + 15 = 65 degrees (magnetic)

8. ACTIVITY

10. MAP ZONES