Worksheet 325 · Skill 5

Set and drift

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1. At 1500 your fix is 131°T, 3.2 nm from Tern Island tower. You steer 061°T at 4.4 kn through the water. At 1530 a new fix puts you 061°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1530 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 1120 your fix is 031°T, 2.6 nm from Westfield church spire. You steer 086°T at 8.3 kn through the water. At 1210 a new fix puts you 334°T, 1.3 nm from Tern Island tower.

   Plot the 1210 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 1335 your fix is 010°T, 1.6 nm from Mill stack. You steer 359°T at 5.2 kn through the water. At 1410 a new fix puts you 189°T, 2.1 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1030 your fix is 075°T, 1.1 nm from Heron Point Light. You steer 334°T at 5.8 kn through the water. At 1105 a new fix puts you 093°T, 2.0 nm from Westfield church spire.

   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 0745 your fix is 358°T, 2.0 nm from Heron Point Light. You steer 331°T at 4.0 kn through the water. At 0825 a new fix puts you 036°T, 2.0 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1115 your fix is 098°T, 1.5 nm from Westfield church spire. You steer 113°T at 7.9 kn through the water. At 1145 a new fix puts you 216°T, 3.3 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0950 your fix is 033°T, 4.1 nm from Gannet Rock daybeacon. You steer 228°T at 8.3 kn through the water. At 1030 a new fix puts you 199°T, 2.0 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1115 your fix is 061°T, 2.9 nm from Tern Island tower. You steer 176°T at 4.0 kn through the water. At 1230 a new fix puts you 117°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1230 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