Navigation Training

Compassworks courses attended

Introduction to GPS - 21 January 2007 ü
Navigation Level 1 - 27 & 28 April 2007 ü
GPS Practice Day - 15 July 2007 ü
Map & Compass Practice Day - 12 August 2007 ü
Navigation Level 2 - 8 & 9 September 2007 ü
Map & Ground Appreciation - 14 October 2007 ü
NNAS Assessment: Bronze (handrail-based) - 25 October 2007 ü
NNAS Assessment: Silver (open country-based) - 25 October 2007 ü
Navigation Level 1 Practice Day - 25 January 2009 ü

Navigation tools used .....

		Silva Type 19L compass This compass clips onto the map to enable fast orienting to the ground. This is best done by placing the centre of the compass over an easting line, as shown here. It also holds the map together nicely!

		Silva Expedition Type 4 compass Features ..... luminous pointer or 'needle' rotating bezel housing with ..... degrees scale guide lines alignment arrow magnetic declination indicators luminous markers roamer for 1:25,000 maps roamer for 1:50,000 maps roamer for 1:63,360 maps cm ruler inch ruler magnifying glass centring drawing/marking circle direction of travel arrow luminous direction indicator three rubber feet for grip on the map lanyard
Abbreviations possible on the housing: MN - magnetic northern hemisphere NME - north magnetic equatorial region SME - south magnetic equatorial region MS - magnetic southern hemisphere "L" is believed to be a date code		Abbreviations: these variations indicate different needle loadings to allow for the different dip of the compass needle towards the magnetic north pole at different latitudes on the earth

		Silva Expedition Type 54 compass Features ..... combination rotating compass card with mirror-image degrees scale for precision bearings & back-bearings plus a luminous pointer or 'needle' rotating bezel housing with ..... normal degrees scale guide lines alignment arrow luminous markers prismatic viewing system enabling 0.5° accuracy (see photos below) roamer for 1:25,000 maps roamer for 1:50,000 maps roamer for 1:63,360 maps cm ruler inch ruler magnifying glass centring drawing/marking circle direction of travel arrow luminous direction indicator three rubber feet for grip on the map lanyard

Degrees scale for prismatic viewer seen in mirror image	Viewing window above "E" with prismatic mirror at far side of housing		Image through viewing window looking at the sighting line near 90° with smaller, simultaneous back-bearing of 270° above.

Pedometer / Step Counter

Silva's basic model - they must all be set to
individual stride length, although that varies
with the terrain. Useful for telling you when
you should be near your target waypoint.
Shows km or miles, plus steps.
Here, showing 1.60 km

Countdown timer

Simple device from Maplins, large easy-to read numbers, counts down from 99 mins 59 seconds. Good alarm clock for telling you when you
should have arrived at a waypoint.
Here, set to count down 5 minutes.
Useful for those with short-term
memory problems .....
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GPS unit - Garmin eTrex Venture Cx

Achievements

Navigation training and events on Dartmoor

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