Mapping and navigation

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Across
  1. 3. The distance you are from the Greenwich line using Cartesian grids
  2. 8. The grid squares on a map
  3. 9. A minor feature, generally in the form of a ridge, running out from a hill or mountain
  4. 11. The presence of iron ores or minerals can affect the compass and this is called _____ ________ ________ (3 words)
  5. 14. Finding your way using a map
  6. 16. The distance between contours (2 words)
  7. 17. A 'net layover' that separates areas into sections
  8. 20. The highest part of a hill or range.
  9. 21. The specific grid you are in or need to refer to (2 words)
  10. 22. The steep hillsadie formed by a sudden drop in the general ground level, usually from a plateau
  11. 24. The area of ground that is in your line of sight and you can actually see
  12. 28. A plan of the ground
  13. 29. The direction from any point of the Earth to the geographical north pole (2 words)
  14. 31. A map that contains information of landscapes and heights (2 words)
  15. 33. Determining the location of something based on measurements from three separate locations
  16. 35. A deep ravine usually with steep sides
  17. 36. The distance you are from the equator using Cartesian grids
  18. 37. The distance from the nearest easterly grid line on the UTM grid (reference from where you are on a map)
  19. 38. A device for accurately measuring the position of a point within a grid square (2 words)
  20. 40. A tableland.
  21. 41. Height divided by ground distance = _________
Down
  1. 1. A depression between adjacent hills or mountain tops
  2. 2. The direction to a point that has been calculated using a compass (2 words)
  3. 4. The difference between grid north and true north (2 words)
  4. 5. Direction a compass points when pointing north (2 words)
  5. 6. A block of information that gives you details of the map so you can locate it within a larger map (3 words)
  6. 7. The direction to a point that has been caluculated using the grids on a map (2 words)
  7. 10. An area of reasonably level ground surrounded, or nearly surrounded, by hills; or an area drained by a river and its tributaries
  8. 12. The angle between the magnetic north and the true north at any place (2 words)
  9. 13. A long, deep and narrow valley worn down by a stream
  10. 15. Direction that the gird of a map indicates is north (2 words)
  11. 18. A map that is used at sea or from the air (2 words)
  12. 19. A valley of ravine, usually between two spurs, running inwards towards the hill or mountain top
  13. 23. Abbreviation for the Universal Transverse Mercator grid reference system
  14. 25. A map that contains information of specific features, for example geological, agricultural and so on (two words)
  15. 26. The accurate directions from one point to another
  16. 27. A map with information on land ownership and boundaries (2 words)
  17. 30. Orient yourself or a map according to specific features on the ground
  18. 32. A small knob-like hill
  19. 34. The distance you are from the south pole (or equator) when you use the UTM grid system
  20. 39. The line along a hill or range of hills from which water flows in opposite directions