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Secrets of the St. Lawrence

The St Lawrence, from 1 to... - Legend

The St. Lawrence, from 1 to... (PDF; 19 KB)


Since the compass points are one of the keys to this publication, we have identified them clearly by capitalizing them in all cases.
Example: North, South, East, West


The term offshore refers to anything that is not right beside the shore.


The shaded portion indicates the wind direction, according to the 8 compass points. In the example below, the illustration indicates Northerly or Northwesterly winds.

Wind compass showing Northerly or Northwesterly wind direction.

Each illustration indicates all of the wind directions users should take into account to ensure pleasant, or at least safe sailing.

Chart numbers

The chart numbers highlighted in the margin refer to the marine charts that are regularly updated by the Canadian Hydrographic Service. These charts are essential for sailors.

Marine chart 4026

The maps are based on climatological charts of the St Lawrence, published by Environment Canada, Québec Region.


Confused or
choppy sea (rip)
 Two wavy lines in a vertical row
Cross sea
 3 chevron shaped lines over laid by 3 reflected chevron shaped lines
 Two waves traveling in opposite directions meeting together to form a larger wave



 Waves (breaking, shoaling, short, steep)
Fog 3 straight lines in a vertical row



Barrier An arrow with a downward slope stacked vertically over a straight line
Channelling A tapering arrow between two opposite semi circles
Convergence One arrowed straight line becoming connected with a downward sloping arrow
Corner An upward sloping line separating from a straight arrow below it
Funnelling A tapering line with an arrow at the narrowest end



Katabatic wind A downward directed Arrow with a “K” inside
Turbulence A counter clockwise directed arrow
Wind opposing current A wave traveling opposite to the direction the arrow beneath (the arrow is indicative of the current direction).

*Symbols used in the local listings, pages 18 to 22

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