The new vessel ‘Galloper’ will be employed all across the Port of London, from the upper reaches of the Thames, out to Clacton on Sea and Margate. The PLA’s hydrographers were initially impressed by Cheetah Marine’s commercial workboat background with hydrographic survey Cheetahs working throughout Europe and as far afield as Saudi Arabia. ‘Galloper’ is one of the popular 7.9m Cheetah Catamarans, which have earned an outstanding reputation as an extremely versatile workboat, complimented by Cheetah Marine’s ability to customise each boat according to the customer’s specific survey applications.
The main duties of the PLA’s hydrographers are to provide accurate charting of the river bed, throughout the 140km tidal stretch of river and estuary that falls under the Authority’s jurisdiction. Following the successful mounting of the 8125 and moonpool system on Surveyor 1, commissioned by the Saudi Ports Authority, Cheetah Marine has worked closely with Reson installing into ‘Galloper’ the new-generation Reson SeaBAT 7125 multibeam echosounder, sound velocity probe and POS MV Motion Sensor by Applanix. The instruments are mounted within a hydrodynamic pod which can, for quayside wall surveying, be tilted at a 40 º angle before being lowered through the moonpool into the water column. With a 400kHz frequency, the 7125 MBES receiver covers a 128º swath with ultra high resolution and a maximum range of 300m.