Worksheet 46 · Skill 5

Set and drift

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1. At 1530 your fix is 220°T, 1.1 nm from Gannet Rock daybeacon. You steer 253°T at 4.7 kn through the water. At 1615 a new fix puts you 041°T, 1.6 nm from Mill stack.

   Plot the 1615 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  

2. At 1040 your fix is 239°T, 3.3 nm from Tern Island tower. You steer 126°T at 4.4 kn through the water. At 1130 a new fix puts you 215°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1130 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 1140 your fix is 245°T, 1.6 nm from Gannet Rock daybeacon. You steer 259°T at 6.7 kn through the water. At 1215 a new fix puts you 027°T, 1.5 nm from Heron Point Light.

   Plot the 1215 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 1220 your fix is 040°T, 3.1 nm from Heron Point Light. You steer 173°T at 4.2 kn through the water. At 1250 a new fix puts you 068°T, 2.4 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0735 your fix is 293°T, 4.0 nm from Tern Island tower. You steer 228°T at 4.0 kn through the water. At 0820 a new fix puts you 108°T, 2.3 nm from Westfield church spire.

   Plot the 0820 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  

6. At 1305 your fix is 033°T, 1.3 nm from Tern Island tower. You steer 289°T at 6.3 kn through the water. At 1340 a new fix puts you 297°T, 3.8 nm from Tern Island tower.

   Plot the 1340 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 0750 your fix is 204°T, 2.0 nm from Tern Island tower. You steer 256°T at 7.2 kn through the water. At 0825 a new fix puts you 021°T, 2.5 nm from Heron Point Light.

   Plot the 0825 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 1240 your fix is 029°T, 1.3 nm from Kittle water tank. You steer 004°T at 6.3 kn through the water. At 1345 a new fix puts you 050°T, 4.1 nm from Gannet Rock daybeacon.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn