Worksheet 299 · Skill 5

Set and drift

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1. At 1240 your fix is 056°T, 3.4 nm from Heron Point Light. You steer 083°T at 7.1 kn through the water. At 1315 a new fix puts you 134°T, 2.6 nm from Tern Island tower.

   Plot the 1315 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 1420 your fix is 013°T, 1.6 nm from Kittle water tank. You steer 286°T at 7.2 kn through the water. At 1500 a new fix puts you 200°T, 2.2 nm from Tern Island tower.

   Plot the 1500 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  

3. At 0935 your fix is 295°T, 1.3 nm from Gannet Rock daybeacon. You steer 048°T at 7.9 kn through the water. At 1015 a new fix puts you 036°T, 4.5 nm from Gannet Rock daybeacon.

   Plot the 1015 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 1030 your fix is 069°T, 1.4 nm from Heron Point Light. You steer 085°T at 8.8 kn through the water. At 1105 a new fix puts you 214°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1105 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 1255 your fix is 273°T, 1.4 nm from Gannet Rock daybeacon. You steer 300°T at 6.9 kn through the water. At 1355 a new fix puts you 015°T, 1.8 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1005 your fix is 021°T, 3.0 nm from Heron Point Light. You steer 138°T at 6.2 kn through the water. At 1040 a new fix puts you 330°T, 1.5 nm from Mill stack.

   Plot the 1040 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 1315 your fix is 020°T, 2.2 nm from Tern Island tower. You steer 262°T at 7.4 kn through the water. At 1350 a new fix puts you 280°T, 2.6 nm from Tern Island tower.

   Plot the 1350 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  

8. At 1305 your fix is 298°T, 3.2 nm from Tern Island tower. You steer 230°T at 4.9 kn through the water. At 1345 a new fix puts you 114°T, 1.2 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn