Worksheet 48 · Skill 5

Set and drift

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1. At 0810 your fix is 062°T, 3.1 nm from Westfield church spire. You steer 106°T at 5.5 kn through the water. At 0840 a new fix puts you 253°T, 2.5 nm from Tern Island tower.

   Plot the 0840 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 1330 your fix is 348°T, 3.1 nm from Kittle water tank. You steer 005°T at 4.0 kn through the water. At 1435 a new fix puts you 071°T, 4.1 nm from Tern Island tower.

   Plot the 1435 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 1340 your fix is 051°T, 2.1 nm from Westfield church spire. You steer 139°T at 4.9 kn through the water. At 1500 a new fix puts you 037°T, 2.4 nm from Mill stack.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1515 your fix is 029°T, 1.4 nm from Heron Point Light. You steer 339°T at 4.5 kn through the water. At 1545 a new fix puts you 355°T, 2.1 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1235 your fix is 293°T, 1.8 nm from Gannet Rock daybeacon. You steer 049°T at 4.5 kn through the water. At 1355 a new fix puts you 058°T, 4.1 nm from Tern Island tower.

   Plot the 1355 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 0805 your fix is 062°T, 5.1 nm from Tern Island tower. You steer 199°T at 5.3 kn through the water. At 0920 a new fix puts you 304°T, 1.5 nm from Kittle water tank.

   Plot the 0920 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 1400 your fix is 276°T, 3.1 nm from Tern Island tower. You steer 138°T at 5.9 kn through the water. At 1430 a new fix puts you 238°T, 2.5 nm from Tern Island tower.

   Plot the 1430 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 1455 your fix is 063°T, 1.4 nm from Westfield church spire. You steer 100°T at 4.4 kn through the water. At 1550 a new fix puts you 252°T, 3.2 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