Worksheet 235 · Skill 5

Set and drift

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1. At 1100 your fix is 047°T, 3.8 nm from Westfield church spire. You steer 142°T at 6.7 kn through the water. At 1145 a new fix puts you 225°T, 3.5 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0720 your fix is 031°T, 2.1 nm from Mill stack. You steer 291°T at 8.6 kn through the water. At 0800 a new fix puts you 112°T, 1.1 nm from Westfield church spire.

   Plot the 0800 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 1110 your fix is 255°T, 1.6 nm from Gannet Rock daybeacon. You steer 055°T at 6.0 kn through the water. At 1155 a new fix puts you 039°T, 4.7 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0940 your fix is 019°T, 2.2 nm from Westfield church spire. You steer 154°T at 7.7 kn through the water. At 1020 a new fix puts you 031°T, 2.4 nm from Heron Point Light.

   Plot the 1020 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 1245 your fix is 211°T, 2.3 nm from Gannet Rock daybeacon. You steer 297°T at 8.9 kn through the water. At 1335 a new fix puts you 103°T, 2.4 nm from Westfield church spire.

   Plot the 1335 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  

6. At 1005 your fix is 246°T, 3.3 nm from Tern Island tower. You steer 262°T at 7.8 kn through the water. At 1035 a new fix puts you 124°T, 1.2 nm from Westfield church spire.

   Plot the 1035 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 1400 your fix is 012°T, 1.5 nm from Tern Island tower. You steer 114°T at 5.3 kn through the water. At 1450 a new fix puts you 052°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1450 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 0805 your fix is 013°T, 2.3 nm from Mill stack. You steer 313°T at 6.5 kn through the water. At 0850 a new fix puts you 080°T, 3.4 nm from Westfield church spire.

   Plot the 0850 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