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/// Sailing Theory - Preferred Channel Markers

Used when there's 2 different navigable channels available, preferred channel markers are placed at the split of channels to indicate that it splits and identifies which is the preferred channel. Like lateral marks, preferred channel buoys have opposite colours depending on the IALA buoyage system you're in and include both port and starboard buoys, each with their own characteristics.

The colour characteristics include a major colour, either red or green, and then a minor colour as a central horizontal stripe, again either green or red. If you're travelling in the direction of buoyage and intend to take the preferred channel, treat the marker as a lateral marker painted in the major colour. If you intend to take the minor channel, treat the marker as a lateral marker painted in the colour of the horizontal stripe.

Lateral Markers Overview - IALA A

Preferred Channels Markers in IALA A

Preferred Channel Markers

Preferred Channel to Port

Preferred Channel to Starboard


Preferred Channel Markers - IALA A - Port
Preferred Channel Markers - IALA A - Starboard

/// Colour

Preferred Channel Markers - IALA A - Preferred Channel to Port - Colours
Preferred Channel Markers - IALA A - Preferred Channel to Starboard - Colours

/// Lights

When fitted, a green light with group flashing 2 + 1
When fitted, a red light with group flashing 2 + 1

/// Chart Symbols

IALA A - Preferred Channel to Port Chart Symbol
IALA A - Preferred Channel to Starboard Chart Symbol

/// Related Theory

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