Voyage Planning and Watch Turnover Simulation

Voyage Planning and Watch Turnover Simulation

Why Voyage Planning Matters

Every coastal passage—no matter how short—requires a written voyage plan before the vessel gets underway. SOLAS regulation V/34 requires the Master to plan the intended voyage before proceeding to sea, and STCW Table A-II/1 holds officer-of-the-watch (OOW) candidates to the same standard. As a deck or engine crew member working toward your AB or QMED credential, you will contribute to—and be held accountable for—the information in that plan. A complete plan prevents grounding, collision, and regulatory violations.

The Four Stages of Voyage Planning

The standard internationally recognized framework has four stages:

1. Appraisal — Gather all relevant information: charts, publications (Coast Pilot, Light List, Notice to Mariners), weather forecasts, tide and current tables, NAVTEX/NAVAREA broadcasts, and any port entry requirements. Identify every hazard along the intended track.

2. Planning — Draw the planned track on the chart. Mark waypoints, course legs, wheel-over positions, danger bearing lines, and no-go areas. Compute expected set and drift from current tables and note where tidal streams will affect the track.

3. Execution — Maintain the plan during the watch. Compare actual position fixes to the planned track at regular intervals (typically every 15 to 30 minutes in coastal waters, or more frequently in restricted waters). Adjust course and speed as necessary, and update the log.

4. Monitoring — Continuously cross-check your primary navigation method against at least one independent backup (e.g., GPS against visual bearings, or radar ranges). If the vessel departs the intended track beyond the pre-set cross-track error limit, take corrective action and notify the Master.

Working with NOAA Charts

Use the current edition of the applicable NOAA chart. Before plotting, confirm the chart's edition date and check for any relevant Notices to Mariners corrections. Transfer all hand-plotted courses and bearings using parallel rulers and a course plotter referenced to the nearest compass rose. Always apply variation (from the compass rose inner ring) and deviation (from the vessel's deviation card) to convert between true and magnetic headings when necessary. Distances are measured with dividers against the mid-latitude scale on the chart's side margin.

Computing Set and Drift

Current will push the vessel off the intended track. Set is the direction the current moves the vessel (expressed in degrees true, toward which it flows). Drift is the speed of that movement in knots. To determine the course to make good (CMG), draw the current vector from the fix position, then construct the water-track vector so that the resultant ground-track vector stays on the planned line. This is the basic current triangle covered in celestial and coastal navigation.

The Deck Logbook

The deck log is a legal document. Required entries for each watch typically include: date and time (UTC and local), vessel position at regular intervals (method of fix noted), heading and speed over ground, weather observations (wind direction and force, sea state, visibility, barometric pressure), communications logged (VHF calls, SECURITÉ or MAYDAY traffic heard), and any course or speed changes with reason. Entries must be in ink, legible, and free of unauthorized erasure—corrections are crossed out with a single line, initialed, and corrected alongside.

Watch Turnover: The Standard Handover Briefing

A formal watch turnover protects the vessel when one watchstander relieves another. Under STCW, the incoming officer must be fully oriented before assuming the watch. The standard checklist items are:

• Vessel position — Current fix, method used, and confidence level
• Heading and speed — Gyro and magnetic compass readings, propulsion setting
• Traffic situation — All vessels on watch, CPA/TCPA for any vessel of concern, any VTS or traffic separation scheme obligations
• Weather — Current conditions, forecast, any active warnings
• Standing orders — Master's standing orders and any night orders in effect
• Outstanding deficiencies — Equipment faults, steering gear status, navigation light status, any AIS or GMDSS anomalies
• Confirmation — The relieving watchstander verbally acknowledges readiness and states: "I have the watch."

Neither party should rush this process. If visibility suddenly worsens or a dangerous situation develops during turnover, the handover is paused until the immediate situation is resolved.

Safety During the Lab

This lab takes place on simulated equipment, but the habits you build here transfer directly to a live bridge:

• Situational awareness first: never allow heads-down chart work to eclipse radar and visual watchkeeping on a real vessel.
• PPE: In the actual engine spaces, hearing protection and appropriate footwear are required; in the lab space, follow posted room rules.
• Lockout/tagout principles: If you are ever directed to inspect or operate actual bridge or engine room controls during integrated labs, verify equipment status before touching switches—never assume a system is de-energized or de-pressurized.
• Report discrepancies: If the simulated data or chart you receive contains an error, flag it to the instructor—that is exactly what a professional watchstander would do aboard ship.

Connecting to Your Credentials

STCW Table A-II/1 specifies the competencies required for officer of the watch on vessels of 500 GT or more. Your voyage plan, log entries, and watch turnover in this lab are assessed against those competencies. The USCG AB practical demonstration also expects basic chartwork and log-keeping ability. Completing this lab with a score of 15/20 or higher, and a complete watch-turnover checklist, demonstrates you meet the watchkeeping standard.