Worksheet 692 · Skill 5

Set and drift

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1. At 1405 your fix is 277°T, 3.2 nm from Tern Island tower. You steer 160°T at 4.3 kn through the water. At 1440 a new fix puts you 214°T, 2.5 nm from Tern Island tower.

   Plot the 1440 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  

2. At 1440 your fix is 008°T, 1.1 nm from Kittle water tank. You steer 282°T at 8.3 kn through the water. At 1510 a new fix puts you 261°T, 1.9 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1445 your fix is 229°T, 3.5 nm from Tern Island tower. You steer 342°T at 5.0 kn through the water. At 1525 a new fix puts you 295°T, 2.7 nm from Tern Island tower.

   Plot the 1525 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 0800 your fix is 053°T, 2.7 nm from Gannet Rock daybeacon. You steer 311°T at 5.6 kn through the water. At 0830 a new fix puts you 081°T, 2.0 nm from Tern Island tower.

   Plot the 0830 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 1325 your fix is 047°T, 3.3 nm from Gannet Rock daybeacon. You steer 201°T at 6.7 kn through the water. At 1405 a new fix puts you 357°T, 1.0 nm from Kittle water tank.

   Plot the 1405 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 1015 your fix is 225°T, 1.7 nm from Tern Island tower. You steer 226°T at 6.9 kn through the water. At 1050 a new fix puts you 040°T, 1.8 nm from Heron Point Light.

   Plot the 1050 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  

7. At 1255 your fix is 056°T, 3.9 nm from Tern Island tower. You steer 259°T at 8.2 kn through the water. At 1335 a new fix puts you 307°T, 2.1 nm from Tern Island tower.

   Plot the 1335 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 1235 your fix is 354°T, 1.4 nm from Heron Point Light. You steer 105°T at 4.2 kn through the water. At 1330 a new fix puts you 351°T, 2.9 nm from Mill stack.

   Plot the 1330 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