b. Without Steering Marks. This procedure is used only on flat, featureless terrain.
(1) The navigator dismounts from the vehicle, which is oriented in the direction of travel, and moves at least 18 meters to the front of the vehicle.
(2) He faces the vehicle and reads the azimuth to the vehicle. By adding or subtracting 180º, he determines the forward azimuth (direction of travel).
(3) On order from the navigator, the driver drives on a straight line to the navigator.
(4) The navigator remounts the vehicle, holds the compass as it will be held while the vehicle is moving, and reads the azimuth in the direction of travel.
(5) The compass will swing off the azimuth determined and pick up a constant deviation. For instance, say the azimuth was 75º while you were away from the vehicle. When you remounted and your driver drove straight forward, your compass showed 67º. You have a deviation of -8º. All you need to do is maintain that 67º compass heading to travel on a 75º magnetic heading.
(6) At night, the same technique can be used. From the map, determine the azimuth you are to travel. Convert the grid azimuth to a magnetic azimuth. Line the vehicle up on that azimuth, then move well in front of it. Be sure it is aligned correctly. Then mount, have the driver move slowly forward, and note the deviation. If the vehicle has a turret, the above procedure works unless you traverse the turret; this changes the deviation.
(7) The distance factor in dead reckoning is easy. Just determine the map distance to travel and add 20 percent to convert to ground distance. Use your vehicle odometer to be sure you travel the proper distance.