Worksheet 687 · Skill 5

Set and drift

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1. At 1035 your fix is 008°T, 2.1 nm from Heron Point Light. You steer 076°T at 8.3 kn through the water. At 1105 a new fix puts you 218°T, 2.1 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1110 your fix is 096°T, 2.4 nm from Gannet Rock daybeacon. You steer 325°T at 7.7 kn through the water. At 1150 a new fix puts you 032°T, 2.4 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1200 your fix is 015°T, 1.5 nm from Heron Point Light. You steer 096°T at 6.7 kn through the water. At 1250 a new fix puts you 226°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1250 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 0700 your fix is 350°T, 0.9 nm from Kittle water tank. You steer 345°T at 6.3 kn through the water. At 0745 a new fix puts you 097°T, 2.2 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1345 your fix is 312°T, 2.0 nm from Tern Island tower. You steer 274°T at 4.6 kn through the water. At 1435 a new fix puts you 287°T, 3.9 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1150 your fix is 058°T, 2.5 nm from Tern Island tower. You steer 274°T at 8.4 kn through the water. At 1245 a new fix puts you 018°T, 2.7 nm from Westfield church spire.

   Plot the 1245 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 1010 your fix is 020°T, 2.6 nm from Westfield church spire. You steer 172°T at 6.9 kn through the water. At 1055 a new fix puts you 119°T, 2.0 nm from Westfield church spire.

   Plot the 1055 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  

8. At 1305 your fix is 056°T, 3.2 nm from Gannet Rock daybeacon. You steer 265°T at 7.9 kn through the water. At 1335 a new fix puts you 314°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1335 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