Worksheet 550 · Skill 5

Set and drift

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1. At 1300 your fix is 099°T, 2.3 nm from Westfield church spire. You steer 131°T at 4.2 kn through the water. At 1350 a new fix puts you 011°T, 2.8 nm from Mill stack.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1505 your fix is 068°T, 5.0 nm from Tern Island tower. You steer 207°T at 6.1 kn through the water. At 1550 a new fix puts you 136°T, 2.9 nm from Tern Island tower.

   Plot the 1550 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  

3. At 1140 your fix is 139°T, 1.8 nm from Westfield church spire. You steer 058°T at 4.7 kn through the water. At 1250 a new fix puts you 228°T, 3.3 nm from Tern Island tower.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1445 your fix is 006°T, 1.1 nm from Heron Point Light. You steer 343°T at 6.1 kn through the water. At 1515 a new fix puts you 019°T, 1.7 nm from Westfield church spire.

   Plot the 1515 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 0955 your fix is 020°T, 1.3 nm from Heron Point Light. You steer 096°T at 7.2 kn through the water. At 1105 a new fix puts you 046°T, 1.5 nm from Kittle water tank.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1305 your fix is 298°T, 1.3 nm from Gannet Rock daybeacon. You steer 262°T at 4.9 kn through the water. At 1410 a new fix puts you 253°T, 3.0 nm from Tern Island tower.

   Plot the 1410 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0820 your fix is 053°T, 2.2 nm from Westfield church spire. You steer 124°T at 4.9 kn through the water. At 0945 a new fix puts you 188°T, 1.2 nm from Gannet Rock daybeacon.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0710 your fix is 144°T, 1.5 nm from Westfield church spire. You steer 065°T at 4.4 kn through the water. At 0800 a new fix puts you 101°T, 2.7 nm from Westfield church spire.

   Plot the 0800 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