Worksheet 313 · Skill 5

Set and drift

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1. At 0840 your fix is 041°T, 2.5 nm from Tern Island tower. You steer 274°T at 4.8 kn through the water. At 1010 a new fix puts you 278°T, 3.1 nm from Tern Island tower.

   Plot the 1010 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1340 your fix is 046°T, 2.7 nm from Heron Point Light. You steer 326°T at 8.6 kn through the water. At 1420 a new fix puts you 006°T, 3.2 nm from Westfield church spire.

   Plot the 1420 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 1150 your fix is 226°T, 2.3 nm from Gannet Rock daybeacon. You steer 299°T at 4.0 kn through the water. At 1230 a new fix puts you 214°T, 3.3 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1410 your fix is 277°T, 2.4 nm from Tern Island tower. You steer 144°T at 5.6 kn through the water. At 1500 a new fix puts you 194°T, 2.4 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0750 your fix is 272°T, 3.1 nm from Tern Island tower. You steer 287°T at 4.6 kn through the water. At 0835 a new fix puts you 004°T, 2.7 nm from Westfield church spire.

   Plot the 0835 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 0710 your fix is 042°T, 4.1 nm from Westfield church spire. You steer 098°T at 5.5 kn through the water. At 0825 a new fix puts you 050°T, 3.6 nm from Tern Island tower.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1350 your fix is 071°T, 2.5 nm from Heron Point Light. You steer 348°T at 5.4 kn through the water. At 1430 a new fix puts you 273°T, 3.6 nm from Tern Island tower.

   Plot the 1430 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 1320 your fix is 053°T, 1.2 nm from Westfield church spire. You steer 072°T at 5.6 kn through the water. At 1415 a new fix puts you 289°T, 2.1 nm from Tern Island tower.

   Plot the 1415 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