Worksheet 230 · Skill 5

Set and drift

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1. At 1450 your fix is 260°T, 2.4 nm from Tern Island tower. You steer 130°T at 5.0 kn through the water. At 1605 a new fix puts you 330°T, 2.6 nm from Kittle water tank.

   Plot the 1605 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1030 your fix is 320°T, 1.8 nm from Tern Island tower. You steer 227°T at 6.2 kn through the water. At 1110 a new fix puts you 030°T, 3.5 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1305 your fix is 021°T, 2.2 nm from Heron Point Light. You steer 087°T at 7.0 kn through the water. At 1350 a new fix puts you 356°T, 1.3 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1350 your fix is 037°T, 2.7 nm from Heron Point Light. You steer 118°T at 4.8 kn through the water. At 1445 a new fix puts you 233°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1445 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  

5. At 1415 your fix is 328°T, 1.5 nm from Heron Point Light. You steer 008°T at 8.2 kn through the water. At 1450 a new fix puts you 024°T, 2.5 nm from Westfield church spire.

   Plot the 1450 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 254°T, 2.6 nm from Gannet Rock daybeacon. You steer 306°T at 4.7 kn through the water. At 1640 a new fix puts you 168°T, 1.4 nm from Westfield church spire.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1005 your fix is 241°T, 2.1 nm from Tern Island tower. You steer 148°T at 5.1 kn through the water. At 1045 a new fix puts you 038°T, 2.0 nm from Mill stack.

   Plot the 1045 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 1430 your fix is 063°T, 4.5 nm from Tern Island tower. You steer 190°T at 5.9 kn through the water. At 1530 a new fix puts you 035°T, 1.9 nm from Kittle water tank.

   Plot the 1530 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn