Approaching a narrow channel with strong tidal currents requires careful planning and skilful navigation. As a Day Skipper, here are the actions you should take:
- Consult tidal charts: Before entering the channel, consult tidal charts and tables to determine the timing and strength of the tidal currents. Pay attention to the predicted high and low tides, as well as any tidal streams that may affect your passage through the channel.
- Calculate slack water times: Identify the times of slack water, when the tidal currents change from ebbing to flowing or vice versa. Slack water provides a period of little if any current, making navigation through the channel easier. Aim to time your entry to coincide with or be close to slack water.
- Determine the best course: Study the channel's layout and consider the direction of the tidal currents. Identify any bends or constrictions in the channel that may increase the strength of the currents. Plan your course to minimise the effects of the currents and take advantage of any eddies or slack water areas.
- Maintain a safe speed: Reduce your vessel's speed as you approach the channel, particularly if your calculations are wrong and the tidal currents are strong. Slower speeds allow for better manoeuvrability and give you more time to react to any unexpected situations.
- Deploy fenders and lines: Deploy fenders on the side of the vessel that may come into contact with the channel walls or other vessels. Use lines to secure the fenders and provide additional protection against potential impacts.
- Assign crew positions: Assign crew members to specific roles to assist with navigation and manoeuvring through the channel. Designate someone as a lookout to monitor the current conditions and provide timely information to the helms-person.
- Use tide and current tables: Refer to tide and current tables, almanac or local knowledge to anticipate any peculiarities or hazards within the channel. Be aware of areas with increased current velocities, shallows, or submerged obstacles that could affect your passage.
- Communicate with other vessels: Use VHF radio to communicate your intentions and listen for any communications from other vessels that may be navigating the same channel. Establish contact with commercial traffic or harbour authorities, if applicable, to obtain information or guidance specific to the channel.
- Be prepared to alter your plan: If the tidal currents are exceptionally strong or conditions become unsafe, be prepared to alter your plan and wait for more favourable conditions. Consider seeking an alternative route or waiting until the tidal currents are more favourable for safe navigation.
- Maintain situational awareness: Continuously monitor your position, course, and speed as you navigate through the channel. Stay aware of any changes in the tidal currents, water depth, or other vessels in the vicinity. Adjust your course and speed as necessary to maintain control and stay clear of potential hazards.
- Consider prepping your anchor should the need arise to deploy it.
There are some tremendous challenges out there, navigating through a narrow channel with strong tidal currents requires careful planning, precise execution and constant attention to the changing conditions. By following these actions and utilising proper seamanship techniques, you can safely navigate and mitigate the effects of tidal currents.