Worksheet 888 · Skill 5

Set and drift

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1. At 0820 your fix is 058°T, 2.2 nm from Tern Island tower. You steer 157°T at 4.9 kn through the water. At 0855 a new fix puts you 136°T, 3.1 nm from Tern Island tower.

   Plot the 0855 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  

2. At 1025 your fix is 008°T, 3.2 nm from Mill stack. You steer 052°T at 4.6 kn through the water. At 1150 a new fix puts you 042°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 1150 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  

3. At 1420 your fix is 312°T, 2.4 nm from Tern Island tower. You steer 278°T at 5.3 kn through the water. At 1510 a new fix puts you 003°T, 2.1 nm from Westfield church spire.

   Plot the 1510 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  

4. At 1315 your fix is 035°T, 2.6 nm from Westfield church spire. You steer 138°T at 4.1 kn through the water. At 1350 a new fix puts you 266°T, 2.9 nm from Tern Island tower.

   Plot the 1350 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  

5. At 1020 your fix is 003°T, 3.5 nm from Westfield church spire. You steer 131°T at 8.0 kn through the water. At 1100 a new fix puts you 041°T, 3.3 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1130 your fix is 147°T, 1.8 nm from Westfield church spire. You steer 114°T at 5.1 kn through the water. At 1210 a new fix puts you 358°T, 2.8 nm from Mill stack.

   Plot the 1210 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 1420 your fix is 012°T, 2.0 nm from Kittle water tank. You steer 012°T at 7.3 kn through the water. At 1450 a new fix puts you 040°T, 4.3 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1535 your fix is 335°T, 2.3 nm from Tern Island tower. You steer 117°T at 4.3 kn through the water. At 1620 a new fix puts you 069°T, 2.7 nm from Tern Island tower.

   Plot the 1620 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