Boresighting and pointing accuracy determination of gun systems

A method of boresighting a gun system, wherein the gun system comprises an electronic pointing system, a pointing device, and a gun tube comprising a gun-tube axis, the method comprising:

• installing a boresight apparatus on an outside surface of the gun tube such that an axis of the boresight apparatus is aligned parallel with the gun-tube axis;
• adjusting the gun tube to a desired gun-tube orientation;
• determining a gun-tube orientation using the boresight apparatus;
• and
• boresighting the gun system based on the gun-tube orientation, wherein boresighting the gun system comprises:
• determining a pointing-device orientation using the pointing device;
• determining offsets between the gun-tube orientation and the pointing-device orientation;
• and
• providing the determined offsets to the pointing device.

A boresight apparatus for a gun system, wherein the gun system comprises a gun tube comprising a gun-tube axis and a pointing device, the boresight apparatus comprising:

• a mount configured to attach the boresight apparatus to an outside surface of the gun tube;
• and
• one or more angle-measurement devices attached to the mount and configured to determine at least one directional angle of the gun tube, wherein the mount is configured to align an axis of the boresight apparatus parallel to the gun-tube axis when the mount is placed on the outside surface of the gun tube,
• wherein the mount comprises a first cylinder and a second cylinder parallel to the first cylinder, wherein the first and second cylinders contact the gun tube when the mount is placed on the outside surface of the gun tube.