Worksheet 625 · Skill 5

Set and drift

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1. At 1410 your fix is 352°T, 3.3 nm from Mill stack. You steer 101°T at 4.6 kn through the water. At 1525 a new fix puts you 186°T, 1.6 nm from Gannet Rock daybeacon.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1235 your fix is 327°T, 2.9 nm from Tern Island tower. You steer 181°T at 5.9 kn through the water. At 1310 a new fix puts you 248°T, 2.5 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  

3. At 1345 your fix is 336°T, 1.0 nm from Kittle water tank. You steer 312°T at 7.6 kn through the water. At 1445 a new fix puts you 257°T, 3.0 nm from Tern Island tower.

   Plot the 1445 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  

4. At 1420 your fix is 044°T, 1.4 nm from Heron Point Light. You steer 358°T at 7.3 kn through the water. At 1455 a new fix puts you 073°T, 3.0 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0920 your fix is 337°T, 1.6 nm from Heron Point Light. You steer 100°T at 6.4 kn through the water. At 0955 a new fix puts you 017°T, 2.4 nm from Mill stack.

   Plot the 0955 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  

6. At 1145 your fix is 330°T, 1.5 nm from Heron Point Light. You steer 096°T at 8.1 kn through the water. At 1250 a new fix puts you 051°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1250 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  

7. At 0715 your fix is 296°T, 4.2 nm from Tern Island tower. You steer 144°T at 5.5 kn through the water. At 0830 a new fix puts you 010°T, 2.4 nm from Mill stack.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1325 your fix is 034°T, 3.6 nm from Heron Point Light. You steer 113°T at 6.0 kn through the water. At 1410 a new fix puts you 301°T, 0.9 nm from Gannet Rock daybeacon.

   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