Worksheet 248 · Skill 5

Set and drift

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1. At 1325 your fix is 118°T, 1.6 nm from Tern Island tower. You steer 020°T at 4.6 kn through the water. At 1400 a new fix puts you 046°T, 3.4 nm from Tern Island tower.

   Plot the 1400 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 1150 your fix is 002°T, 2.5 nm from Mill stack. You steer 344°T at 4.0 kn through the water. At 1305 a new fix puts you 319°T, 1.9 nm from Tern Island tower.

   Plot the 1305 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  

3. At 1220 your fix is 243°T, 2.9 nm from Tern Island tower. You steer 007°T at 5.2 kn through the water. At 1250 a new fix puts you 302°T, 3.3 nm from Tern Island tower.

   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  

4. At 1555 your fix is 067°T, 2.6 nm from Heron Point Light. You steer 035°T at 4.1 kn through the water. At 1635 a new fix puts you 241°T, 2.6 nm from Tern Island tower.

   Plot the 1635 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  

5. At 1340 your fix is 058°T, 1.9 nm from Heron Point Light. You steer 289°T at 7.2 kn through the water. At 1410 a new fix puts you 151°T, 1.5 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1450 your fix is 035°T, 3.7 nm from Westfield church spire. You steer 153°T at 7.3 kn through the water. At 1525 a new fix puts you 039°T, 3.1 nm from Heron Point Light.

   Plot the 1525 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 1010 your fix is 159°T, 1.1 nm from Westfield church spire. You steer 079°T at 4.9 kn through the water. At 1100 a new fix puts you 236°T, 3.5 nm from Tern Island tower.

   Plot the 1100 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  

8. At 1050 your fix is 297°T, 3.7 nm from Tern Island tower. You steer 187°T at 4.5 kn through the water. At 1200 a new fix puts you 039°T, 2.4 nm from Heron Point Light.

   Plot the 1200 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn