Worksheet 375 · Skill 5

Set and drift

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1. At 1005 your fix is 008°T, 2.1 nm from Mill stack. You steer 323°T at 5.1 kn through the water. At 1035 a new fix puts you 041°T, 2.7 nm from Heron Point Light.

   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  

2. At 1410 your fix is 052°T, 3.3 nm from Tern Island tower. You steer 183°T at 4.5 kn through the water. At 1510 a new fix puts you 099°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1510 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  

3. At 1315 your fix is 074°T, 2.0 nm from Tern Island tower. You steer 049°T at 4.3 kn through the water. At 1355 a new fix puts you 038°T, 4.3 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1350 your fix is 341°T, 1.5 nm from Heron Point Light. You steer 082°T at 4.8 kn through the water. At 1455 a new fix puts you 157°T, 3.2 nm from Tern Island tower.

   Plot the 1455 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  

5. At 0950 your fix is 250°T, 3.3 nm from Tern Island tower. You steer 003°T at 4.0 kn through the water. At 1035 a new fix puts you 293°T, 4.3 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1555 your fix is 057°T, 2.3 nm from Westfield church spire. You steer 122°T at 4.5 kn through the water. At 1645 a new fix puts you 257°T, 1.8 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0700 your fix is 031°T, 2.7 nm from Westfield church spire. You steer 170°T at 5.9 kn through the water. At 0730 a new fix puts you 003°T, 1.8 nm from Heron Point Light.

   Plot the 0730 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 1235 your fix is 347°T, 1.9 nm from Tern Island tower. You steer 081°T at 5.5 kn through the water. At 1310 a new fix puts you 044°T, 2.2 nm from Tern Island tower.

   Plot the 1310 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