Worksheet 518 · Skill 5

Set and drift

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1. At 1250 your fix is 280°T, 2.1 nm from Gannet Rock daybeacon. You steer 299°T at 6.0 kn through the water. At 1335 a new fix puts you 052°T, 2.9 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1135 your fix is 022°T, 3.2 nm from Westfield church spire. You steer 122°T at 8.2 kn through the water. At 1205 a new fix puts you 252°T, 2.7 nm from Tern Island tower.

   Plot the 1205 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 0850 your fix is 316°T, 1.1 nm from Gannet Rock daybeacon. You steer 204°T at 6.5 kn through the water. At 0920 a new fix puts you 248°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 0920 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 0755 your fix is 046°T, 3.1 nm from Gannet Rock daybeacon. You steer 239°T at 4.0 kn through the water. At 0920 a new fix puts you 205°T, 3.0 nm from Tern Island tower.

   Plot the 0920 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1235 your fix is 053°T, 1.6 nm from Kittle water tank. You steer 002°T at 7.1 kn through the water. At 1315 a new fix puts you 062°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1315 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 1345 your fix is 161°T, 1.2 nm from Gannet Rock daybeacon. You steer 018°T at 7.3 kn through the water. At 1430 a new fix puts you 062°T, 5.5 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1450 your fix is 010°T, 1.4 nm from Gannet Rock daybeacon. You steer 239°T at 7.0 kn through the water. At 1535 a new fix puts you 033°T, 1.3 nm from Mill stack.

   Plot the 1535 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  

8. At 1040 your fix is 052°T, 2.0 nm from Heron Point Light. You steer 317°T at 5.7 kn through the water. At 1130 a new fix puts you 035°T, 2.9 nm from Westfield church spire.

   Plot the 1130 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