Directing point

A cut-away drawing of a Coast Artillery battery, showing its two base and stations (upper left), the plotting room (with plotting board), and the directing point (DP) (between the two guns, at right). The directing point, on the surface of the blast apron, is indicated by the red dot. Each gun's displacement (the distance from the pintle center of the gun to the DP) is also indicated.

A copper bolt set in concrete marks the DP for the mortars of Battery Whitman at Fort Andrews in Boston Harbor.

The directing point for Battery Stevenson at Fort Warren, Boston Harbor, set in the grass strip between its two guns.

The directing point (DP) was a term used in the U.S. Coast Artillery to identify a precisely surveyed point that was used as the point of reference for preparing the firing data used to aim the guns of a given Coast Artillery battery.

Often the DP was taken as the pintle center of the right-most gun in a battery, as an observer looked over the battery towards the sea. In this case, the referenced gun was called the directing gun.

单词	Directing point
释义	Directing point 英语百科 Directing point The directing point (DP) was a term used in the U.S. Coast Artillery to identify a precisely surveyed point that was used as the point of reference for preparing the firing data used to aim the guns of a given Coast Artillery battery. Often the DP was taken as the pintle center of the right-most gun in a battery, as an observer looked over the battery towards the sea. In this case, the referenced gun was called the directing gun.
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