MIL-PRF-10436N
OTHER GOVERNMENT DOCUMENTS
DEPARTMENT OF INTERIOR, U.S. GEOLOGICAL SURVEY
ISOGONIC CHARTS
Epoch 1995 Map No. GP1002-D
Magnetic Declination of the U.S.
Epoch 1995 Map No. GP1002-F
Magnetic Total Intensity of the U.S.
Epoch 1995 Map No. GP986-V
Magnetic Vertical Intensity of the U.S.
Epoch 1995 Map No. GP986-H
Magnetic Horizontal Intensity of the U.S.
(Application for copies should be addressed to Map Distribution, U.S. Geological Survey, Box
25286, Federal Center, Denver, CO 80225.)
2.3 Order of precedence. In the event of a conflict between the text of this document and the
references cited herein, the text of this document takes precedence. Nothing in this document,
however, will supersede applicable laws and regulations unless a specific exemption has been
obtained.
3. REQUIREMENTS
3.1 Description. The compass (see Figure 1A and 1B) shall be an induction-damped, hand-
held, north-seeking instrument with internal, self-exciting light source.
3.2 First article. Unless otherwise specified (see 6.2), a sample shall be subjected to first
article inspection.
3.3 Design, materials, and manufacturing processes. Unless otherwise specified, the design,
materials, and manufacturing processes are the prerogative of the contractor as long as all
articles submitted to the government meet the operating, environmental, and support
requirements specified.
3.3.1 Material deterioration prevention and control. The compass shall be fabricated from
compatible materials, inherently corrosion resistant or treated to provide protection against the
various forms of corrosion and deterioration to which they are susceptible.
3.4
Operating requirements.
3.4.1 Graduations. The compass shall be graduated in degrees and mils. The degree
graduations shall be semi-gloss red (see 6.11) and identified at 5 degree intervals. They shall be
numbered every 20 degrees, with north being 0 degrees. The north arrow may be used in lieu of
the "0" degree marking. The mil graduations shall be semi-gloss black (see 6.11) and identified
at 20 mil intervals. They shall be numbered every 200 mils, using only hundreds and thousands
digits (i.e., 2, 4, 6, ...64 represent 200, 400, 600, ...6400 mils). North shall be identified as 6400
mils. All graduations shall be distinguishable in day and night conditions (see 4.4.1.1).
3.4.2 Scale. The compass shall have a scale of 1:50000 with graduations of 100 meters, 0 to
6000 minimum, along the length of the compass, in the opened configuration (if applicable) (see
4.4.1.2)
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