An apparatus for applying a method for managing the integration of multiple pipeline datasets into a combined dataset or superset otherwise known as an asset survey. The achievable throughput is estimated in the available channels. The worker is then free to accurately position the safety cage component to one side of the ladder. A support plate 8 comprising a collar portion 9 and a projecting plate portion 10 is mounted on the neck portion 3 of the container 2, below the head 7. A plurality of pole-teeth protrude from the rim of the circular hole and the pole-teeth are symmetric. Also, projecting a first light from the tracker to the retroreflector, reflecting a second light from the retroreflector, the second light being a portion of the first light and obtaining first sensed data by sensing a third light, the third light being a portion of the second light.