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Harwich, Essex. Several shots of buoys at a warehouse on the quay. Various shots show the Trinity House Vessel 'Siren' setting out to sea to carry out maintenance on buoys; a naval flag showing the Union Jack and the Trinity House Jack is hoisted; officers are seen using sextants and plotting their course on a chart. Nice M/S of a sailor tying on a life jacket. Sailors drop anchor beside a buoy, hoist weather balloons and ring bells on the ship. The buoy is cleaned of mussels and limpets...
Alberta's government is proposing to partner with Indigenous communities to build a new West Coast oil export project. In B.C. waters, oil tanker spill prevention depends on locally operated escort tugboats and expert local marine pilots, who safely guide tankers in and out of port. On the southern tip of Vancouver Island, escort tugboats are operated in partnership with the Scia’new First Nation in the community’s territorial waters.
Required tug power and number of tugs needed in variable conditions of wind, current and waves isin most cases an assessment made by pilots based on their professional experience. However, assessments will raise questions by lawyers if something goes wrong. They will use tools to calculate what really is needed with respect to tug power and number of tugs. They have furthermore the advantage of time.
A handy and simple tool to determine in a minimum time what is really needed as tug assistance, is the Bollard Pull Calculator which calculates in an approximate way the total required tug power for ships in various conditions of wind and current. This tool can be loaded as an app on the smart phone.