Worksheet 826 · Skill 5

Set and drift

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1. At 1015 your fix is 239°T, 2.4 nm from Tern Island tower. You steer 247°T at 4.1 kn through the water. At 1105 a new fix puts you 338°T, 1.3 nm from Heron Point Light.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1425 your fix is 013°T, 2.2 nm from Tern Island tower. You steer 088°T at 8.3 kn through the water. At 1455 a new fix puts you 069°T, 4.9 nm from Tern Island tower.

   Plot the 1455 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  

3. At 0910 your fix is 073°T, 2.4 nm from Westfield church spire. You steer 051°T at 4.3 kn through the water. At 1005 a new fix puts you 296°T, 2.5 nm from Tern Island tower.

   Plot the 1005 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  

4. At 0940 your fix is 265°T, 3.5 nm from Tern Island tower. You steer 120°T at 8.6 kn through the water. At 1015 a new fix puts you 245°T, 1.9 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1555 your fix is 043°T, 2.3 nm from Gannet Rock daybeacon. You steer 262°T at 6.5 kn through the water. At 1650 a new fix puts you 228°T, 3.3 nm from Tern Island tower.

   Plot the 1650 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  

6. At 1040 your fix is 031°T, 2.6 nm from Tern Island tower. You steer 266°T at 6.9 kn through the water. At 1155 a new fix puts you 081°T, 1.8 nm from Westfield church spire.

   Plot the 1155 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 0710 your fix is 249°T, 2.0 nm from Tern Island tower. You steer 228°T at 5.3 kn through the water. At 0750 a new fix puts you 034°T, 2.4 nm from Heron Point Light.

   Plot the 0750 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 1325 your fix is 347°T, 1.7 nm from Tern Island tower. You steer 276°T at 5.4 kn through the water. At 1440 a new fix puts you 051°T, 4.1 nm from Westfield church spire.

   Plot the 1440 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