pack 31 navigation pack 3. pack 32 lessons in pack 3 contours bearings estimating timings os map...
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Pack 3 1
Navigation Pack 3
Pack 3 2
Lessons in Pack 3
• Contours
• Bearings
• Estimating Timings
• OS map symbols
Pack 3 3
Contour LinesContour lines indicate the height of the land above sea level.
They are useful to indicate hills and steep valleys.
Contour lines are at 10 metre height intervals
Contours close together indicate a steep slopeContours further apart
indicate a gentle slope
Pack 3 4
Contour Lines Activity
Match the hill profile (A-B) with the contour line (1-6)
Pack 3 5
Compass & Bearings
When using a compass, the big arrow in the middle of the plastic rectangle always points in the direction you want to go.
That’s true for finding a bearing on a map, and for walking on a bearing
The number where the big arrow crosses the dial is the compass bearing
The dial needs to be rotated to point North
This can be North on a map (the top of the map) when reading a bearing on a map
Or lined up with the red magnetic needle when walking on a bearing
The red end of the needle points North
(sometimes black)
Pack 3 6
Measuring a Bearing on a Map
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31
38
27
39 41 4240
To find the bearing from Weston Church to Aston Church:
1. Point big arrow from Weston church to Aston church (or line up the edge of the compass)
2. Rotate the dial to point to North on the map (the top of the map) and align to the blue grid line
3. Read the number where the big arrow crosses the dial
From this example you can see that the bearing from Weston church to Aston church is 50o
Pack 3 7
Measure a Bearing
28
29
30
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38
27
39 41 4240
What is the bearing from Aston church to the church in Chellaston?
Pack 3 8
Walking on a BearingTo walk on a bearing
1. Measure the bearing on which you want to walk from the map (e.g.145o)
2. Rotate the dial so that the big arrow crosses 145o
3. Move the whole compass so that the red magnetic needle lines up with the red arrow in the dial
4. Walk in the direction of the big black arrowThis is useful for navigating in
conditions of poor visibility (fog, snow, night)
Pack 3 9
Estimating Time for walks
Scouts walking pace
100m = 1min 30 second
Nasmith’s Rule (use when walking up hills)
For every 10 metre height gain add an extra minuteOrFor every brown contour line crossed add an extra minute
Estimate of time to walk from the sheep fold to Nether Moor:Horizontal distance: 800 metresHeight gained: 127 metres
800m x 1min 30sec = 12 minutes127m ÷ 10 = 12.7 minutesTotal time = 12 + 12.7 minutes = 24.7 minutes
Activity:
Estimate the time to walk from the top of Nether moor to Madwoman’s Stones
Pack 3 10
OS Map SymbolsHeights Rock Features
Water Features
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