Worksheet 740 · Skill 5

Set and drift

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1. At 1450 your fix is 292°T, 4.3 nm from Tern Island tower. You steer 189°T at 4.0 kn through the water. At 1545 a new fix puts you 042°T, 1.1 nm from Heron Point Light.

   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  

2. At 0720 your fix is 143°T, 1.1 nm from Westfield church spire. You steer 037°T at 4.5 kn through the water. At 0750 a new fix puts you 061°T, 1.7 nm from Westfield church spire.

   Plot the 0750 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 0750 your fix is 202°T, 1.5 nm from Gannet Rock daybeacon. You steer 326°T at 4.5 kn through the water. At 0825 a new fix puts you 235°T, 1.4 nm from Tern Island tower.

   Plot the 0825 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 1310 your fix is 077°T, 3.7 nm from Westfield church spire. You steer 132°T at 5.9 kn through the water. At 1350 a new fix puts you 009°T, 3.0 nm from Mill stack.

   Plot the 1350 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  

5. At 1015 your fix is 006°T, 2.1 nm from Heron Point Light. You steer 083°T at 4.7 kn through the water. At 1110 a new fix puts you 002°T, 3.3 nm from Mill stack.

   Plot the 1110 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 1210 your fix is 186°T, 1.7 nm from Gannet Rock daybeacon. You steer 325°T at 5.0 kn through the water. At 1245 a new fix puts you 160°T, 1.4 nm from Tern Island tower.

   Plot the 1245 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 0945 your fix is 229°T, 2.0 nm from Gannet Rock daybeacon. You steer 076°T at 4.7 kn through the water. At 1025 a new fix puts you 167°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1025 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  

8. At 1045 your fix is 013°T, 2.6 nm from Mill stack. You steer 060°T at 4.7 kn through the water. At 1135 a new fix puts you 140°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1135 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn