Worksheet 276 · Skill 5

Set and drift

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1. At 0940 your fix is 035°T, 2.1 nm from Heron Point Light. You steer 095°T at 5.6 kn through the water. At 1100 a new fix puts you 137°T, 2.5 nm from Tern Island tower.

   Plot the 1100 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0845 your fix is 010°T, 2.3 nm from Heron Point Light. You steer 035°T at 4.1 kn through the water. At 0955 a new fix puts you 304°T, 4.4 nm from Tern Island tower.

   Plot the 0955 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  

3. At 1110 your fix is 046°T, 2.2 nm from Westfield church spire. You steer 125°T at 6.2 kn through the water. At 1200 a new fix puts you 001°T, 3.3 nm from Mill stack.

   Plot the 1200 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 0820 your fix is 058°T, 1.8 nm from Heron Point Light. You steer 338°T at 7.9 kn through the water. At 0900 a new fix puts you 035°T, 2.4 nm from Westfield church spire.

   Plot the 0900 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 0725 your fix is 053°T, 1.6 nm from Gannet Rock daybeacon. You steer 253°T at 4.8 kn through the water. At 0830 a new fix puts you 073°T, 2.1 nm from Heron Point Light.

   Plot the 0830 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  

6. At 1300 your fix is 335°T, 2.3 nm from Mill stack. You steer 331°T at 5.8 kn through the water. At 1335 a new fix puts you 111°T, 2.3 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1055 your fix is 315°T, 3.1 nm from Tern Island tower. You steer 252°T at 5.6 kn through the water. At 1140 a new fix puts you 026°T, 1.9 nm from Westfield church spire.

   Plot the 1140 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 1020 your fix is 022°T, 2.5 nm from Tern Island tower. You steer 137°T at 5.7 kn through the water. At 1050 a new fix puts you 034°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1050 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