Worksheet 69 · Skill 5

Set and drift

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1. At 1225 your fix is 038°T, 4.1 nm from Westfield church spire. You steer 183°T at 4.4 kn through the water. At 1345 a new fix puts you 063°T, 3.1 nm from Heron Point Light.

   Plot the 1345 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0945 your fix is 006°T, 2.2 nm from Mill stack. You steer 057°T at 4.5 kn through the water. At 1050 a new fix puts you 080°T, 3.1 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1325 your fix is 034°T, 3.2 nm from Heron Point Light. You steer 313°T at 4.4 kn through the water. At 1420 a new fix puts you 085°T, 2.1 nm from Westfield church spire.

   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  

4. At 1250 your fix is 053°T, 1.5 nm from Heron Point Light. You steer 106°T at 6.5 kn through the water. At 1325 a new fix puts you 053°T, 1.4 nm from Mill stack.

   Plot the 1325 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 294°T, 4.3 nm from Tern Island tower. You steer 175°T at 4.1 kn through the water. At 1720 a new fix puts you 346°T, 2.5 nm from Mill stack.

   Plot the 1720 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1315 your fix is 357°T, 2.0 nm from Mill stack. You steer 300°T at 6.6 kn through the water. At 1350 a new fix puts you 033°T, 2.5 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1110 your fix is 081°T, 2.7 nm from Tern Island tower. You steer 196°T at 4.9 kn through the water. At 1140 a new fix puts you 355°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1140 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 1125 your fix is 211°T, 1.6 nm from Tern Island tower. You steer 208°T at 5.1 kn through the water. At 1155 a new fix puts you 209°T, 3.2 nm from Tern Island tower.

   Plot the 1155 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