Worksheet 27 · Skill 5

Set and drift

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1. At 1325 your fix is 235°T, 1.1 nm from Gannet Rock daybeacon. You steer 104°T at 4.6 kn through the water. At 1355 a new fix puts you 105°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1355 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  

2. At 1225 your fix is 152°T, 1.5 nm from Westfield church spire. You steer 120°T at 4.0 kn through the water. At 1300 a new fix puts you 063°T, 2.0 nm from Heron Point Light.

   Plot the 1300 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  

3. At 1130 your fix is 086°T, 2.9 nm from Gannet Rock daybeacon. You steer 321°T at 7.5 kn through the water. At 1215 a new fix puts you 031°T, 2.0 nm from Tern Island tower.

   Plot the 1215 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 0925 your fix is 222°T, 2.3 nm from Gannet Rock daybeacon. You steer 285°T at 5.0 kn through the water. At 1005 a new fix puts you 343°T, 2.7 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1240 your fix is 057°T, 3.8 nm from Tern Island tower. You steer 198°T at 4.6 kn through the water. At 1330 a new fix puts you 041°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1330 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 0805 your fix is 220°T, 2.4 nm from Tern Island tower. You steer 166°T at 4.3 kn through the water. At 0845 a new fix puts you 024°T, 1.4 nm from Mill stack.

   Plot the 0845 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  

7. At 1130 your fix is 079°T, 3.2 nm from Westfield church spire. You steer 063°T at 6.0 kn through the water. At 1205 a new fix puts you 323°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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1305 your fix is 015°T, 1.0 nm from Kittle water tank. You steer 307°T at 7.4 kn through the water. At 1340 a new fix puts you 280°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1340 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