1. Uncontrolled copy not subject to amendment Basic Navigation Using Map and Compass

2. Learning Outcome 5: Be able to recognise weather conditions that affect land navigation

3. Hot and Cold Air Masses

4. Main Air Masses Width of the arrows indicates the frequency of occurrence

5. Weather Map

6. Fronts and Frontal Depressions Numbers refer to pressure in millibars

7. Weather Map – Westerly Winds

8. Depression Chart

9. Depression

10. Fronts and Frontal Depressions Section through a frontal system Cold front is steeper than the warm front

11. Upper Winds Weather map showing isobars for both upper and lower winds

15. Local Warming

16. High and Low Pressure

17. Approaching Rain

18. Depression X Section

19. Warm Front

20. Cold Front

21. Occluded Front

22. Pockets of Air

23. Thermals above

24. Air rising over mountains

25. Rising Air Dewpoint

26. Cloudy foothills

27. High and Low Pressure

28. Funnels and Eddies

29. Banner Clouds

30. Temperature Inversion

31. Cross Section