Worksheet 89 · Skill 5

Set and drift

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1. At 0920 your fix is 007°T, 2.4 nm from Westfield church spire. You steer 158°T at 5.3 kn through the water. At 1020 a new fix puts you 304°T, 3.5 nm from Mill stack.

   Plot the 1020 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  

2. At 1330 your fix is 033°T, 2.6 nm from Westfield church spire. You steer 160°T at 4.1 kn through the water. At 1500 a new fix puts you 239°T, 2.3 nm from Gannet Rock daybeacon.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1530 your fix is 058°T, 2.3 nm from Westfield church spire. You steer 175°T at 4.8 kn through the water. At 1600 a new fix puts you 036°T, 1.9 nm from Heron Point Light.

   Plot the 1600 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  

4. At 1005 your fix is 183°T, 1.9 nm from Gannet Rock daybeacon. You steer 268°T at 4.0 kn through the water. At 1035 a new fix puts you 226°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1035 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 1225 your fix is 096°T, 1.9 nm from Tern Island tower. You steer 205°T at 6.7 kn through the water. At 1305 a new fix puts you 023°T, 2.7 nm from Mill stack.

   Plot the 1305 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  

6. At 1505 your fix is 017°T, 2.1 nm from Westfield church spire. You steer 088°T at 4.8 kn through the water. At 1545 a new fix puts you 297°T, 2.5 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  

7. At 0930 your fix is 076°T, 3.0 nm from Westfield church spire. You steer 172°T at 4.8 kn through the water. At 1025 a new fix puts you 069°T, 1.9 nm from Heron Point Light.

   Plot the 1025 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  

8. At 1000 your fix is 091°T, 1.1 nm from Heron Point Light. You steer 010°T at 7.3 kn through the water. At 1030 a new fix puts you 029°T, 3.6 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn