1.9 Orienting Circle – BLUE
(Fig 2)
Printed on the bottom of the vial, the adjustable blue orienting circle is used in bearing and
clinometer measurements as well as magnetic declination adjustments. Additionally, the blue
orienting line extending across the vial allows for precise bearing and clinometer measurments,
as well as map alignment.
1.10 Clinometer Arrow – GREEN (Fig 2)
Located inside the vial, the weighted green clinometer arrow points to the ground when the
Eclipse 8099 is positioned on its side. Use the green clinometer arrow in combination with the
blue
orienting circle, to measure angle of inclination.
1.11 Quick Reference Information Cards (Fig 3)
The quick reference cards supply quick, valuable information on navigation, formulas and scales
for field use.
1.12 Magnetic Declination Scale (Fig 3)
Magnetic declination is the difference between true north and magnetic north, at a position. The
magnetic declination scale, located on the bottom of the azimuth ring, is used in combination
with the adjustable blue
orienting circle to set the Eclipse 8099 for magnetic declination.
1.13 Clinometer Index Mark (Fig 3)
Use the clinometer index mark in combination with the green clinometer arrow and the blue
orienting circle to measure angles up or down from the horizon.
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