While the "circle" man is measuring the grids azimuth, an assistant (the "post" man) moves toward the desired mortar position with the two aiming posts. To begin the hasty survey, set the M2 aiming circle over the known point, level it, index the declination constant using the azimuth micrometer knob, and, with the nonrecording (lower) motion, orient the magnetic needle toward north. The hasty survey begins at that point, using the pivot point of the M16 plotting board to represent that selected known position ( Figure C-6).Ī. This identifies the mortar position on a map by eight-digit grid coordinates. If the angles are plotted with a standard protractor (accurate to about 10 mils) and oriented over a 1:50,000 scale map, the resection should be accurate within 100 meters.Ī terrain feature or man-made object is needed close to the desired mortar position for a hasty survey. The dot on the tracing paper represents the location of the aiming circle (mortar position) on the map.įigure C-5. Place the tracing paper over the map of the area and slide it around until it is positioned so that the three lines pass through their respective distant points ( Figure C-5). Protractor aligned with correct azimuth.įigure C-4. With a protractor aligned with the correct azimuth on the line ( Figure C-3), draw two lines from the dot on the measured azimuths ( Figure C-4).įigure C-3. Draw a line from this dot in any direction ( Figure C-2).Į. On tracing paper, place a dot representing the aiming circle location.ĭ. Preferably, the angles between the points should be greater than 400 mils.Ĭ. With an aiming circle, measure the azimuth to those points. Identify three distant points that also appear on a map ( Figure C-1).ī. Graphic resection is a simple method using the aiming circle, tracing paper, and a map.Ī. Whenever possible, a more accurate method of location should be used. Often, the location of those positions can be determined by a simple map spot location. The platoon may be required to locate its own roving gun (split section) and primary, alternate, or supplementary position as accurately as possible. If the resection cannot be performed from platoon center, the platoon center coordinates can be estimated on the basis of the coordinates of the nearby resected point. The mortar position should be constantly improved to include more accurate platoon center location.Ī graphic resection can be used to establish the coordinates of a point or to check the accuracy of a map spot. Two such methods are described in this appendix. With the "roving mortars" concept, new methods of position location are needed. Normally, a map spot location to six-digit or eight-digit grid coordinates is estimated by the platoon supervisor that is the most qualified. APPENDIX C FIELD-EXPEDIENT SURVEY TECHNIQUES Surveyed locations may be provided by the artillery survey personnel.
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