SAR Fundamentals/Navigation instruments theory

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Material covered

SAR Fundamentals Ch.13 "Navigation"
Basic SAR Skills Manual: Ch.7 "Navigation"
stride count

Time alloted

1.5hr - 09:30 - 11:30

Compass

Features to look for in compass:

  • straight edge
  • ruler (scale)
  • barrel in degrees
  • roamer
  • sighting mirror
  • declination
  • clinometer
  • needle zones

Good compasses:

  • SUUNTU MC-2G
  • Silva Ranger
  • approx $70

Declination: http://geomag.nrcan.gc.ca/apps/mdcal-eng.php

  • 2012-01 Pincher Creek, 14deg 38' E

Student Questions

  • How does global compass work at any latitude?

From http://www.mapworld.co.nz/global.html

In the global compass, this problem has been solved with a structural innovation. The needle and magnet are built as separate units functioning independently from each other, so that the inclination of the magnetic field cannot tilt the needle. The needle can no longer move vertically. It is the compass magnet, separated from the needle, which absorbs the vertical force of the magnetic field. The needle itself is fixed at the lid by means of a double jeweled bearing. The magnet rotates with its jewel bearing on a pin. Such a compass works reliably in all zones of the world. Due to the strong magnet, the needle settles very quickly and stops immediately at the right position, allowing for an extremely accurate reading.

GPS

  • GPS component covers up to 1:13 of the attached lesson plan
    • Waypoints are not an essential skill for using GPS. Students should be recording locations on paper, and should be able to estimate relative direction and distance to a new location.
      • This material can be covered in additional material presented by a SAR group outside the SAR Fundamentals course.

Image:GPS-lesson-plan.odt (pdf)

WAAS

Altitude/Azimuth calculator for WAAS geosynchronous satellites

Aids

  • compasses for students
  • 5 Pincher SAR Garmin eTrex GPS's
  • 1 Brett Wuth's Garmin eTrex GPS
  • 5 copies topo map of locale (82 H/5)
  • copy for each student of local street map
  • copy for each student of PCSAR Doc-69 “GPS - Set-Up and Maintenance”
  • copy for each student of outside exercise sheet, adapted to locale
  • Radios
  • /Question bank
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