Worksheet 531 · Skill 5

Set and drift

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1. At 1100 your fix is 099°T, 2.3 nm from Gannet Rock daybeacon. You steer 290°T at 8.2 kn through the water. At 1130 a new fix puts you 151°T, 1.2 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1205 your fix is 085°T, 1.2 nm from Westfield church spire. You steer 115°T at 6.1 kn through the water. At 1315 a new fix puts you 030°T, 2.4 nm from Mill stack.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1355 your fix is 020°T, 1.9 nm from Kittle water tank. You steer 008°T at 8.1 kn through the water. At 1435 a new fix puts you 067°T, 3.3 nm from Tern Island tower.

   Plot the 1435 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  

4. At 1230 your fix is 353°T, 1.9 nm from Mill stack. You steer 345°T at 5.6 kn through the water. At 1320 a new fix puts you 056°T, 3.6 nm from Westfield church spire.

   Plot the 1320 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  

5. At 1445 your fix is 025°T, 2.2 nm from Kittle water tank. You steer 278°T at 8.6 kn through the water. At 1540 a new fix puts you 061°T, 1.4 nm from Heron Point Light.

   Plot the 1540 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 1020 your fix is 279°T, 3.0 nm from Tern Island tower. You steer 059°T at 7.8 kn through the water. At 1050 a new fix puts you 009°T, 2.2 nm from Tern Island tower.

   Plot the 1050 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 1355 your fix is 290°T, 3.8 nm from Tern Island tower. You steer 164°T at 7.0 kn through the water. At 1435 a new fix puts you 052°T, 2.4 nm from Heron Point Light.

   Plot the 1435 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 1115 your fix is 337°T, 2.1 nm from Mill stack. You steer 009°T at 5.2 kn through the water. At 1200 a new fix puts you 031°T, 3.6 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn