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Determining course to steer
Determining Course to Steer

On November 18, 2003 we plan on leaving Thieves Bay Marina, Mouat Point Light (L4846.5’N 12318.75’W) for Isabella Island (L4843.75’N 12325.75’W). We will use the current information for Swanson Channel. The chart shows the flood direction to be 360. Using our current prediction tables, we determine that that the drift is 1 knot. Our boat speed is 5 knots. Our course to make good is 242T. We need to gauge our speed made good and our course to steer. Knowing the distance to travel our estimated time of arrival can also be computed. We can also calculate estimated positions.


Determining course to steer1
Determining Course to Steer

Step 1 – Draw and label the course to make good.

CMG 242 T

S 5.0


Determining course to steer2
Determining Course to Steer

Step2 - Draw and label the set / drift line

CMG 242 T


Determining course to steer3
Determining Course to Steer

Step 3 – From the end of set / drift line scribe an arc the length of the speed. Connect and label.

S 5.0

CMG 242 T


Determining course to steer4
Determining Course to Steer

Step 4 – Measure CMG line to scribe mark – SMG. Label the SMG

S 5.0

CMG 242 T

SMG 4.4


Determining course to steer5
Determining Course to Steer

Step 5 – Use plotter to determine course. Label the line

C 232 T

S 5.0

CMG 242 T

SMG 4.4


Determining course to steer6
Determining Course to Steer

Step 6 – Draw a course /speed line from departure (Mouat Point Light). Label.

C 232 T

S 5.0

CMG 242 T

SMG 4.4

C 232 T

S 5.0


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