Worksheet 781 · Skill 5

Set and drift

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1. At 0900 your fix is 349°T, 0.9 nm from Kittle water tank. You steer 271°T at 8.0 kn through the water. At 0945 a new fix puts you 354°T, 3.2 nm from Mill stack.

   Plot the 0945 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  

2. At 1140 your fix is 034°T, 4.3 nm from Gannet Rock daybeacon. You steer 181°T at 7.9 kn through the water. At 1215 a new fix puts you 130°T, 1.8 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1355 your fix is 301°T, 1.7 nm from Kittle water tank. You steer 305°T at 6.4 kn through the water. At 1455 a new fix puts you 111°T, 1.5 nm from Westfield church spire.

   Plot the 1455 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  

4. At 1240 your fix is 303°T, 2.0 nm from Tern Island tower. You steer 276°T at 6.0 kn through the water. At 1320 a new fix puts you 048°T, 3.4 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1055 your fix is 032°T, 2.3 nm from Tern Island tower. You steer 246°T at 6.5 kn through the water. At 1150 a new fix puts you 037°T, 2.5 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1545 your fix is 307°T, 1.6 nm from Kittle water tank. You steer 289°T at 8.3 kn through the water. At 1640 a new fix puts you 139°T, 1.3 nm from Westfield church spire.

   Plot the 1640 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  

7. At 1050 your fix is 337°T, 1.3 nm from Kittle water tank. You steer 024°T at 4.7 kn through the water. At 1205 a new fix puts you 056°T, 3.7 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1110 your fix is 057°T, 1.4 nm from Westfield church spire. You steer 083°T at 4.9 kn through the water. At 1145 a new fix puts you 279°T, 3.3 nm from Tern Island tower.

   Plot the 1145 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