Worksheet 746 · Skill 5

Set and drift

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1. At 0950 your fix is 070°T, 3.2 nm from Westfield church spire. You steer 141°T at 8.7 kn through the water. At 1030 a new fix puts you 038°T, 2.4 nm from Mill stack.

   Plot the 1030 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1155 your fix is 216°T, 1.9 nm from Gannet Rock daybeacon. You steer 331°T at 8.9 kn through the water. At 1240 a new fix puts you 303°T, 3.8 nm from Tern Island tower.

   Plot the 1240 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  

3. At 1510 your fix is 019°T, 2.9 nm from Westfield church spire. You steer 162°T at 5.0 kn through the water. At 1545 a new fix puts you 103°T, 1.9 nm from Westfield church spire.

   Plot the 1545 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  

4. At 1435 your fix is 038°T, 1.9 nm from Heron Point Light. You steer 329°T at 9.0 kn through the water. At 1510 a new fix puts you 026°T, 2.1 nm from Westfield church spire.

   Plot the 1510 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 1450 your fix is 230°T, 2.9 nm from Tern Island tower. You steer 088°T at 4.9 kn through the water. At 1545 a new fix puts you 227°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1545 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1550 your fix is 027°T, 1.1 nm from Heron Point Light. You steer 113°T at 6.5 kn through the water. At 1625 a new fix puts you 034°T, 1.2 nm from Mill stack.

   Plot the 1625 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  

7. At 1230 your fix is 073°T, 1.9 nm from Gannet Rock daybeacon. You steer 275°T at 5.2 kn through the water. At 1300 a new fix puts you 327°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1300 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 1325 your fix is 009°T, 2.3 nm from Westfield church spire. You steer 100°T at 4.3 kn through the water. At 1420 a new fix puts you 239°T, 2.1 nm from Tern Island tower.

   Plot the 1420 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn