Worksheet 766 · Skill 5

Set and drift

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1. At 1020 your fix is 001°T, 1.7 nm from Heron Point Light. You steer 333°T at 4.2 kn through the water. At 1055 a new fix puts you 137°T, 1.2 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1525 your fix is 053°T, 3.5 nm from Heron Point Light. You steer 103°T at 7.3 kn through the water. At 1610 a new fix puts you 169°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1610 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 1110 your fix is 008°T, 1.4 nm from Westfield church spire. You steer 111°T at 4.2 kn through the water. At 1145 a new fix puts you 072°T, 1.9 nm from Westfield church spire.

   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  

4. At 0815 your fix is 323°T, 1.3 nm from Gannet Rock daybeacon. You steer 254°T at 4.5 kn through the water. At 0905 a new fix puts you 206°T, 1.8 nm from Tern Island tower.

   Plot the 0905 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  

5. At 1335 your fix is 036°T, 2.0 nm from Kittle water tank. You steer 346°T at 4.9 kn through the water. At 1415 a new fix puts you 034°T, 4.0 nm from Gannet Rock daybeacon.

   Plot the 1415 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 1220 your fix is 167°T, 1.6 nm from Tern Island tower. You steer 053°T at 4.0 kn through the water. At 1305 a new fix puts you 051°T, 3.4 nm from Gannet Rock daybeacon.

   Plot the 1305 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 0840 your fix is 228°T, 2.6 nm from Tern Island tower. You steer 253°T at 5.9 kn through the water. At 0920 a new fix puts you 035°T, 0.9 nm from Heron Point Light.

   Plot the 0920 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  

8. At 1415 your fix is 079°T, 1.2 nm from Gannet Rock daybeacon. You steer 295°T at 4.0 kn through the water. At 1445 a new fix puts you 316°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1445 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