Worksheet 314 · Skill 5

Set and drift

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1. At 1555 your fix is 126°T, 1.2 nm from Westfield church spire. You steer 113°T at 4.0 kn through the water. At 1640 a new fix puts you 059°T, 2.4 nm from Heron Point Light.

   Plot the 1640 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1020 your fix is 170°T, 1.1 nm from Gannet Rock daybeacon. You steer 252°T at 6.8 kn through the water. At 1050 a new fix puts you 345°T, 1.9 nm from Mill stack.

   Plot the 1050 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0925 your fix is 298°T, 4.3 nm from Tern Island tower. You steer 158°T at 8.6 kn through the water. At 0955 a new fix puts you 049°T, 3.5 nm from Heron Point Light.

   Plot the 0955 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1540 your fix is 059°T, 4.0 nm from Tern Island tower. You steer 177°T at 7.6 kn through the water. At 1615 a new fix puts you 100°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1615 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1600 your fix is 032°T, 2.7 nm from Heron Point Light. You steer 128°T at 7.9 kn through the water. At 1635 a new fix puts you 041°T, 2.2 nm from Mill stack.

   Plot the 1635 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1525 your fix is 083°T, 2.4 nm from Tern Island tower. You steer 139°T at 4.2 kn through the water. At 1555 a new fix puts you 066°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1555 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0850 your fix is 087°T, 1.5 nm from Tern Island tower. You steer 163°T at 4.2 kn through the water. At 0920 a new fix puts you 334°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 0920 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1150 your fix is 070°T, 2.4 nm from Westfield church spire. You steer 114°T at 6.4 kn through the water. At 1220 a new fix puts you 249°T, 3.0 nm from Tern Island tower.

   Plot the 1220 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn