Worksheet 613 · Skill 5

Set and drift

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1. At 0905 your fix is 086°T, 3.6 nm from Westfield church spire. You steer 235°T at 6.4 kn through the water. At 0935 a new fix puts you 182°T, 1.0 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1520 your fix is 270°T, 1.8 nm from Tern Island tower. You steer 189°T at 5.7 kn through the water. At 1610 a new fix puts you 346°T, 1.0 nm from Mill stack.

   Plot the 1610 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 1535 your fix is 020°T, 1.8 nm from Heron Point Light. You steer 080°T at 5.1 kn through the water. At 1610 a new fix puts you 212°T, 2.9 nm from Tern Island tower.

   Plot the 1610 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 0930 your fix is 015°T, 1.7 nm from Mill stack. You steer 082°T at 4.5 kn through the water. At 1030 a new fix puts you 233°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1030 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  

5. At 1245 your fix is 073°T, 1.3 nm from Heron Point Light. You steer 004°T at 5.0 kn through the water. At 1335 a new fix puts you 079°T, 2.8 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1045 your fix is 351°T, 1.9 nm from Tern Island tower. You steer 117°T at 5.9 kn through the water. At 1145 a new fix puts you 054°T, 3.5 nm from Gannet Rock daybeacon.

   Plot the 1145 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  

7. At 0935 your fix is 192°T, 1.5 nm from Tern Island tower. You steer 211°T at 5.3 kn through the water. At 1005 a new fix puts you 011°T, 2.0 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1230 your fix is 332°T, 1.7 nm from Tern Island tower. You steer 089°T at 4.6 kn through the water. At 1325 a new fix puts you 053°T, 2.5 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn