Navigation Course

Syllabus

Lesson 1

Map Basics

  • Map scales
  • Measuring distances
  • National grid
  • Grid references
  • Setting the map – By identifiable features
  • Contours
  • Basics
  • Slopes/steepness – clinometer. gradient, i.e.
    • 8 contour lines in 500m = 16 in 1000m= 160m climb in 1000m vertical = 16%
    • 100% = 45 degrees
    • Index contours = every 50m
    • 10 index contours (500m) in 500m horiz = 45 degrees
    • 2 index contours in 500m horiz = 10 degrees
  • Compass
  • Basic parts
  • True North (Day/night)
  • Grid north (covered earlier)
  • Magnetic north
  • Finding GMA
  • “Mag to Grid – get rid, Grid to Mag – add”

Map exercise

Practical 1

19/03/04, Exmoor

Lesson 2

Setting the map – compass

  • Basic (hold compass over map rotate until compass needle and grid lines match
  • Accurate (set compass with GMA, set compass body with grid lines, rotate until north arrow falls within orienting arrow)

Taking a bearing from the map

Walking on a bearing

  • Good visibility
  • Poor visibility
  • Night

Taking a bearing from the ground (you know where you are)

Finding your position from identifiable features

Use of transits

Back bearings (no need to subtract/add 180 deg)

Resection

Map exercise

Lesson 3

Revision from Lesson 1 & 2

Basic navigation

Timing (Naismiths rule)

  • work out speed (average 5km/h) or 3kph if fully laden
  • 12 min per km
  • add 5 min for every index (50m) contour climbed or 1 min for every 10m contour climbed
  • For short sections of downhill: gentle -1 mins/30 m descent
  • v steep +1min/30m descent

Pacing

Slopes – aspect of slope/contouring/tick off points

Aiming off/attack points

Route planning

Escape routes

Map exercise

Practical 2

Night navigation on Snelsmore Common

Practical 3

25/07/2004 Elan Valley

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