Worksheet 204 · Skill 5

Set and drift

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1. At 0935 your fix is 164°T, 1.2 nm from Tern Island tower. You steer 074°T at 5.1 kn through the water. At 1015 a new fix puts you 068°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1015 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 0705 your fix is 111°T, 2.4 nm from Westfield church spire. You steer 102°T at 6.0 kn through the water. At 0745 a new fix puts you 352°T, 2.2 nm from Mill stack.

   Plot the 0745 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  

3. At 1500 your fix is 008°T, 1.6 nm from Heron Point Light. You steer 101°T at 6.0 kn through the water. At 1545 a new fix puts you 349°T, 2.9 nm from Mill stack.

   Plot the 1545 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 1515 your fix is 335°T, 2.6 nm from Kittle water tank. You steer 298°T at 5.8 kn through the water. At 1545 a new fix puts you 267°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1545 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 1550 your fix is 226°T, 2.2 nm from Gannet Rock daybeacon. You steer 030°T at 8.0 kn through the water. At 1630 a new fix puts you 062°T, 2.1 nm from Tern Island tower.

   Plot the 1630 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 1025 your fix is 077°T, 2.4 nm from Heron Point Light. You steer 014°T at 4.2 kn through the water. At 1110 a new fix puts you 248°T, 3.1 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0940 your fix is 247°T, 1.5 nm from Tern Island tower. You steer 283°T at 7.5 kn through the water. At 1010 a new fix puts you 055°T, 3.3 nm from Westfield church spire.

   Plot the 1010 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 1030 your fix is 058°T, 2.7 nm from Westfield church spire. You steer 059°T at 6.5 kn through the water. At 1105 a new fix puts you 312°T, 1.7 nm from Tern Island tower.

   Plot the 1105 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