To engage a PDF, you are allowed to traverse and search over the entire dangerous avenue of approach, so the PDF is generally in the center of the sector. Lay the gun on the near end of the PDF and take the direction reading. Laying for elevation is accomplished by firing the PDF and adjusting the center of impact onto the near end of the avenue of approach. The gun is then fired employing traverse and search to cover the entire target. The number of mils of traverse and search necessary to cover the target should be recorded on the range card and a firing sequence established.
A range card is a rough sketch or drawing which serves as both a record of firing data and a document for defensive fire planning. Each gun makes a range card in duplicate using the available Standard Range Card form (DA Form 5517-R). See figure 6-39. In the event that a gun crew does not have this standard form, the range card should be drawn on any material available. One copy remains at the gun position as a record of firing data. The gunner uses the card to recall the data to fire on predetermined targets and as an aid in estimating ranges to other targets during good visibility. The other copy is sent to the next higher headquarters (usually the company), who use it to organize the defense and prepare a fire plan sketch. Regardless of the length of time the gun crew expects to occupy a position, preparation of a range card begins immediately. Revisions and improvements are made later as necessary. To construct a range card, the sketch first must be oriented, then the data obtained must be recorded.
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