Worksheet 257 · Skill 5

Set and drift

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1. At 1120 your fix is 332°T, 2.4 nm from Tern Island tower. You steer 196°T at 4.3 kn through the water. At 1230 a new fix puts you 247°T, 3.1 nm from Tern Island tower.

   Plot the 1230 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  

2. At 0815 your fix is 342°T, 2.0 nm from Heron Point Light. You steer 096°T at 4.4 kn through the water. At 0905 a new fix puts you 330°T, 1.5 nm from Mill stack.

   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  

3. At 0940 your fix is 044°T, 3.4 nm from Westfield church spire. You steer 126°T at 8.0 kn through the water. At 1015 a new fix puts you 214°T, 2.8 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1050 your fix is 006°T, 1.3 nm from Kittle water tank. You steer 014°T at 6.0 kn through the water. At 1130 a new fix puts you 053°T, 4.0 nm from Gannet Rock daybeacon.

   Plot the 1130 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 0935 your fix is 299°T, 4.3 nm from Tern Island tower. You steer 094°T at 7.8 kn through the water. At 1025 a new fix puts you 062°T, 4.7 nm from Tern Island tower.

   Plot the 1025 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 1255 your fix is 209°T, 1.8 nm from Gannet Rock daybeacon. You steer 289°T at 4.8 kn through the water. At 1355 a new fix puts you 082°T, 1.2 nm from Heron Point Light.

   Plot the 1355 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  

7. At 0845 your fix is 102°T, 2.7 nm from Westfield church spire. You steer 077°T at 5.3 kn through the water. At 0920 a new fix puts you 248°T, 2.0 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1305 your fix is 126°T, 2.0 nm from Westfield church spire. You steer 134°T at 8.1 kn through the water. At 1335 a new fix puts you 326°T, 1.9 nm from Mill stack.

   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