obstacle crossing

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• Crossing the River —   First American edition cover …   Wikipedia

• Obstacle Collision Avoidance System — The Obstacle Collision Avoidance System (OCAS) is designed to alert pilots if their aircraft is in immediate danger of flying into an obstacle. OCAS uses a low power ground based radar to provide detection and tracking of an aircraft s proximity… …   Wikipedia

• Overhead line crossing — An overhead line crossing is the crossing of an obstacle such as a traffic route, a river, a valley or a strait by an overhead power line. The style of crossing depends on the local conditions and regulations at the time the power line is… …   Wikipedia

• Minimum crossing altitude — In aviation, a minimum crossing altitude, or MCA, is the lowest altitude at which a navigational fix can be crossed when entering or continuing along an airway that will allow an aircraft to clear all obstacles while carrying out a normal climb… …   Wikipedia

• Level crossing — This article is about at grade intersections between railway and road. For where two rail lines cross, see level junction. For a type of nuclear receptor (RXR), see Retinoid X receptor. A level crossing at Chertsey, England, as the barriers rise …   Wikipedia

• Water (obstacle) — Water is often used in equestrian events as an obstacle for jumping, most notably in the cross country phase of eventing, as well as in show jumping. Water in EventingWater is seen on the cross country course of an equestrian competitive event.… …   Wikipedia

• hasty crossing — The crossing of an inland water obstacle using the crossing means at hand or those readily available, and made without pausing for elaborate preparations. See also deliberate crossing …   Military dictionary

• Ems powerline crossing — The 380kV Ems Overhead Powerline Crossing is a power line crossing for two circuits on the Ems River South of Weener. It is mounted on two 84 meter tall pylons with two crossbars. The length of the span is 405 meters. [… …   Wikipedia

• deliberate crossing — The crossing of an inland water obstacle that requires extensive planning and detailed preparations. See also hasty crossing …   Military dictionary

• Combat engineering — is a combat service support role of using the knowledge, tools and techniques of engineering by troops in peace and war, but specifically in combat. A combat engineer, in many armies also called pioneer or sapper, is a military specialist in… …   Wikipedia

• No. 4 Commando — after a raid on France, April 1942. Active 1940–1946 Country …   Wikipedia