Worksheet 114 · Skill 5

Set and drift

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1. At 1430 your fix is 210°T, 3.1 nm from Tern Island tower. You steer 289°T at 6.5 kn through the water. At 1500 a new fix puts you 083°T, 3.4 nm from Westfield church spire.

   Plot the 1500 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  

2. At 0905 your fix is 018°T, 2.5 nm from Heron Point Light. You steer 005°T at 4.2 kn through the water. At 0955 a new fix puts you 044°T, 3.9 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1555 your fix is 053°T, 3.9 nm from Westfield church spire. You steer 145°T at 5.7 kn through the water. At 1705 a new fix puts you 224°T, 3.4 nm from Tern Island tower.

   Plot the 1705 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1445 your fix is 265°T, 2.1 nm from Tern Island tower. You steer 156°T at 4.6 kn through the water. At 1525 a new fix puts you 351°T, 2.9 nm from Mill stack.

   Plot the 1525 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 1455 your fix is 354°T, 1.0 nm from Kittle water tank. You steer 299°T at 5.1 kn through the water. At 1550 a new fix puts you 247°T, 2.5 nm from Tern Island tower.

   Plot the 1550 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 1140 your fix is 036°T, 2.2 nm from Kittle water tank. You steer 286°T at 6.6 kn through the water. At 1225 a new fix puts you 259°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1225 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  

7. At 1505 your fix is 193°T, 1.8 nm from Gannet Rock daybeacon. You steer 277°T at 7.3 kn through the water. At 1605 a new fix puts you 012°T, 2.5 nm from Heron Point Light.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0930 your fix is 035°T, 4.1 nm from Westfield church spire. You steer 088°T at 7.6 kn through the water. At 1030 a new fix puts you 043°T, 2.4 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn