Worksheet 176 · Skill 5

Set and drift

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1. At 0710 your fix is 006°T, 1.7 nm from Tern Island tower. You steer 263°T at 4.6 kn through the water. At 0810 a new fix puts you 031°T, 2.2 nm from Westfield church spire.

   Plot the 0810 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 0845 your fix is 032°T, 2.4 nm from Westfield church spire. You steer 131°T at 8.6 kn through the water. At 0935 a new fix puts you 233°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 0935 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 0930 your fix is 059°T, 3.4 nm from Heron Point Light. You steer 069°T at 4.1 kn through the water. At 1005 a new fix puts you 273°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1005 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  

4. At 1015 your fix is 342°T, 1.3 nm from Tern Island tower. You steer 091°T at 7.4 kn through the water. At 1055 a new fix puts you 065°T, 4.7 nm from Tern Island tower.

   Plot the 1055 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 0900 your fix is 260°T, 3.6 nm from Tern Island tower. You steer 053°T at 4.6 kn through the water. At 0940 a new fix puts you 357°T, 2.3 nm from Tern Island tower.

   Plot the 0940 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 1325 your fix is 267°T, 2.9 nm from Tern Island tower. You steer 148°T at 5.0 kn through the water. At 1410 a new fix puts you 024°T, 1.5 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0845 your fix is 007°T, 2.9 nm from Westfield church spire. You steer 147°T at 7.9 kn through the water. At 0935 a new fix puts you 215°T, 3.3 nm from Tern Island tower.

   Plot the 0935 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  

8. At 1600 your fix is 353°T, 2.0 nm from Mill stack. You steer 351°T at 4.8 kn through the water. At 1645 a new fix puts you 082°T, 3.3 nm from Westfield church spire.

   Plot the 1645 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