Worksheet 413 · Skill 5

Set and drift

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1. At 0910 your fix is 007°T, 1.9 nm from Kittle water tank. You steer 352°T at 6.4 kn through the water. At 1000 a new fix puts you 064°T, 1.5 nm from Tern Island tower.

   Plot the 1000 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  

2. At 1115 your fix is 329°T, 1.4 nm from Heron Point Light. You steer 050°T at 8.6 kn through the water. At 1150 a new fix puts you 294°T, 1.7 nm from Tern Island tower.

   Plot the 1150 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  

3. At 1420 your fix is 159°T, 1.1 nm from Gannet Rock daybeacon. You steer 028°T at 6.7 kn through the water. At 1515 a new fix puts you 062°T, 5.4 nm from Tern Island tower.

   Plot the 1515 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  

4. At 1245 your fix is 351°T, 1.4 nm from Gannet Rock daybeacon. You steer 122°T at 4.2 kn through the water. At 1325 a new fix puts you 043°T, 2.3 nm from Kittle water tank.

   Plot the 1325 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 1520 your fix is 226°T, 2.5 nm from Tern Island tower. You steer 326°T at 7.8 kn through the water. At 1600 a new fix puts you 042°T, 4.7 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1405 your fix is 062°T, 4.2 nm from Tern Island tower. You steer 219°T at 7.2 kn through the water. At 1455 a new fix puts you 018°T, 2.8 nm from Mill stack.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1330 your fix is 030°T, 2.7 nm from Tern Island tower. You steer 272°T at 5.6 kn through the water. At 1410 a new fix puts you 313°T, 3.1 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1255 your fix is 038°T, 1.1 nm from Kittle water tank. You steer 277°T at 9.0 kn through the water. At 1345 a new fix puts you 345°T, 2.9 nm from Mill stack.

   Plot the 1345 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