A professional who measures range and horizontal and vertical angles to enemy artillery flashes and projectile bursts, using flash ranging equipment in observation post. Respnsibilities include:

• Selects location site for observation post.
• Performs traverse survey to establish coordinate location of observation post.
• Orients and calibrates flash ranging instruments.
• Observes enemy weapon flashes during firing and projectile bursts, using flash ranging instrument, and records horizontal and vertical angles to flash or burst.
• Computes data to determine distance and direction of enemy emplacement.
• Confers with artillery personnel to report location of enemy forces and effectiveness of friendly fire weapons.