The symbol A950 to the north-east of IREWA is

The symbol A950 to the north-east of IREWA is most likely a trigonometrical station. Trigonometrical stations, also known as triangulation stations, are landmarks used in surveying and mapping to establish the exact location and elevation of a point on the earth's surface. They are typically marked with a symbol, such as a triangle or a circle, and a unique identification code, such as A950 in this case. Bench marks are similar to trigonometrical stations, but they are used to mark the elevation of a point on the ground, rather than its location. Spot heights are used to indicate the elevation of a particular point on a map, but they are not physical markers on the ground. Beacons are used for navigation and are typically tall structures used as landmarks to help travelers determine their location.