Forth Estuary Towage (FET) is a wholly owned subsidiary of Forth Ports Limited. The FET fleet consists of four vessels, ranging from smaller, highly-manoeuvrable Voith Schneider tugs with Bollard Pulls of 19 to 50 tonnes, to a modern state-of-the-art Azimuth Stern Drive Terminal tug, at 70 tonnes Bollard Pull. All FET tugs are ISM compliant, and FET also holds ISO 50001 and ISO 14001 on Energy and Environment as well as OHSAS 18001 as part of Forth Ports.