Worksheet 582 · Skill 5

Set and drift

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1. At 1505 your fix is 097°T, 2.9 nm from Westfield church spire. You steer 034°T at 6.3 kn through the water. At 1545 a new fix puts you 322°T, 3.1 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0910 your fix is 254°T, 1.1 nm from Gannet Rock daybeacon. You steer 314°T at 5.0 kn through the water. At 0945 a new fix puts you 279°T, 2.1 nm from Tern Island tower.

   Plot the 0945 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  

3. At 0905 your fix is 347°T, 1.0 nm from Gannet Rock daybeacon. You steer 218°T at 4.8 kn through the water. At 1000 a new fix puts you 012°T, 1.7 nm from Mill stack.

   Plot the 1000 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 1155 your fix is 247°T, 2.2 nm from Tern Island tower. You steer 310°T at 4.2 kn through the water. At 1225 a new fix puts you 291°T, 3.1 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0725 your fix is 082°T, 3.2 nm from Tern Island tower. You steer 281°T at 4.2 kn through the water. At 0815 a new fix puts you 002°T, 2.6 nm from Tern Island tower.

   Plot the 0815 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  

6. At 1455 your fix is 027°T, 2.0 nm from Gannet Rock daybeacon. You steer 229°T at 5.0 kn through the water. At 1610 a new fix puts you 227°T, 3.3 nm from Tern Island tower.

   Plot the 1610 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 1330 your fix is 036°T, 3.6 nm from Heron Point Light. You steer 334°T at 5.1 kn through the water. At 1410 a new fix puts you 050°T, 4.0 nm from Westfield church spire.

   Plot the 1410 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 0745 your fix is 302°T, 1.5 nm from Kittle water tank. You steer 331°T at 5.0 kn through the water. At 0815 a new fix puts you 258°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 0815 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