Bridge Watch: Helm Orders, Steering, and Compass Work

Bridge Watch: Helm Orders, Steering, and Compass Work

Every mariner standing a bridge watch must be able to steer a steady course, respond instantly to helm orders, and read both the magnetic and gyrocompass accurately. These skills protect the vessel, the crew, and the cargo, and they are tested by both the U.S. Coast Guard and STCW examiners.

Standard Helm Orders

The International Maritime Organization (IMO) and the U.S. Coast Guard recognize a standard set of helm orders that must be used on any vessel subject to STCW. Using these exact words—and no others—prevents misunderstanding between the officer of the watch (OOW) and the helmsman.

• Hard to starboard / Hard to port – Put the rudder to its maximum angle in the named direction. This is used in emergencies or tight maneuvering situations.
• Right / Left [number] degrees rudder – Apply the stated rudder angle. Example: "Right fifteen degrees rudder" means place the rudder 15° to starboard.
• Ease to [number] – Reduce the rudder angle to the stated number. Example: "Ease to five" means bring the rudder back to 5° from whatever greater angle it was at.
• Meet her – Apply opposite rudder to check the vessel's swing. Used when the heading is approaching the target course.
• Steady / Steady as she goes – Steer the course the vessel is on at the moment the order is given. Stop the swing.
• Midships – Return the rudder to zero degrees (rudder amidships, no angle applied).
• Nothing to port / Nothing to starboard – Steer so that the heading does not drift in the named direction; used when precision track-keeping matters near a hazard.

Repeat-Back Protocol

Every helm order must be verbally acknowledged before it is executed, and the helmsman must report when the order has been carried out. This three-step loop—order, repeat-back, completion report—is required by STCW and is a critical safety practice.

1. OOW gives order: "Right fifteen degrees rudder."

2. Helmsman repeats before moving the wheel: "Right fifteen degrees rudder, aye."

3. Helmsman reports execution: "Rudder is right fifteen."

If the helmsman does not understand or did not hear the order clearly, they must say so immediately. Never guess at an order or execute a command that was not clearly heard.

Steering Technique

Good helmsmanship means applying small, anticipatory rudder corrections rather than chasing the compass card with large wheel movements. As a general rule:

• Watch the rate of swing (how fast the heading number is changing), not just the heading itself.
• Apply corrective rudder before the vessel reaches the desired course so that the swing is arrested right on the heading.
• Use meet her to stop a swing, then ease to midships and make small adjustments to maintain the course.
• Every vessel steers differently. Allow time to learn a ship's response time (called advance and transfer).

During a course change ordered by the OOW, the helmsman applies rudder, repeats back, and calls out the new heading as it is steadied: "Steady on course two-seven-zero, sir/ma'am."

Magnetic Compass and Gyrocompass

A bridge carries at least two independent compasses: a magnetic compass and a gyrocompass.

Magnetic compass – Aligns with Earth's magnetic field. It is affected by magnetic variation (the difference between true north and magnetic north at a given location, shown on the nautical chart) and deviation (caused by the vessel's own magnetic field, recorded on a deviation card posted near the compass). The magnetic compass requires no power and is the back-up standard.

Gyrocompass – Aligns with true north by using a spinning gyroscope and Earth's rotation. It is unaffected by magnetic interference but depends on electrical power. Most modern steering repeaters and autopilots are slaved to the gyrocompass.

Gyro Error

Gyrocompasses can drift slightly from true north. Gyro error is determined by comparing the gyro reading to a known true bearing (from a celestial observation, a GPS bearing, or a charted range). In practice aboard a training vessel or simulator, students compare the gyrocompass heading to the magnetic compass heading and apply the known variation and deviation to find the difference.

Gyro error is expressed as East (the gyro reads high—more than true) or West (the gyro reads low—less than true).

Formula: Gyro Error = Gyro Heading − True Heading

• If the result is positive, error is East.
• If the result is negative, error is West.

Logbook Entries

All compass comparisons must be entered in the official logbook using nautical notation: time in four-digit format (e.g., 0845), heading in three digits (e.g., 270°), compass type, and any calculated error. Accurate, timely logbook entries are a legal requirement and a professional standard.

Safety Points

• Always wear non-slip footwear on the bridge or training vessel.
• Never leave the helm unattended while under helm orders; the OOW must formally relieve you before you step away.
• Report any mechanical steering abnormality (stiff wheel, failure to respond) to the OOW immediately and loudly.
• Know the location of the emergency steering changeover procedure posted at the helm station before the watch begins.
• On a simulator, treat all procedures exactly as you would on a real vessel—habits formed in training transfer directly to sea.