Worksheet 784 · Skill 5

Set and drift

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1. At 0925 your fix is 013°T, 1.0 nm from Westfield church spire. You steer 106°T at 7.4 kn through the water. At 1005 a new fix puts you 246°T, 2.7 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0910 your fix is 088°T, 1.1 nm from Westfield church spire. You steer 095°T at 8.4 kn through the water. At 1030 a new fix puts you 024°T, 2.2 nm from Kittle water tank.

   Plot the 1030 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1045 your fix is 020°T, 1.7 nm from Mill stack. You steer 065°T at 4.1 kn through the water. At 1200 a new fix puts you 163°T, 0.8 nm from Gannet Rock daybeacon.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0755 your fix is 344°T, 1.1 nm from Gannet Rock daybeacon. You steer 136°T at 4.3 kn through the water. At 0825 a new fix puts you 074°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 0825 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  

5. At 1510 your fix is 052°T, 2.2 nm from Heron Point Light. You steer 076°T at 5.9 kn through the water. At 1610 a new fix puts you 339°T, 2.7 nm from Kittle water tank.

   Plot the 1610 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1025 your fix is 155°T, 1.7 nm from Gannet Rock daybeacon. You steer 278°T at 7.4 kn through the water. At 1100 a new fix puts you 353°T, 2.4 nm from Mill stack.

   Plot the 1100 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  

7. At 0715 your fix is 031°T, 0.9 nm from Gannet Rock daybeacon. You steer 337°T at 4.5 kn through the water. At 0815 a new fix puts you 041°T, 1.7 nm from Tern Island tower.

   Plot the 0815 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1040 your fix is 029°T, 2.7 nm from Westfield church spire. You steer 162°T at 8.7 kn through the water. At 1110 a new fix puts you 024°T, 2.5 nm from Heron Point Light.

   Plot the 1110 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