Worksheet 179 · Skill 5

Set and drift

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1. At 0935 your fix is 020°T, 2.8 nm from Heron Point Light. You steer 053°T at 6.1 kn through the water. At 1020 a new fix puts you 317°T, 2.2 nm from Tern Island tower.

   Plot the 1020 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  

2. At 1150 your fix is 094°T, 2.6 nm from Gannet Rock daybeacon. You steer 251°T at 7.7 kn through the water. At 1230 a new fix puts you 230°T, 2.3 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1220 your fix is 000°T, 2.2 nm from Tern Island tower. You steer 145°T at 7.0 kn through the water. At 1300 a new fix puts you 058°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1300 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  

4. At 1005 your fix is 030°T, 1.9 nm from Gannet Rock daybeacon. You steer 176°T at 5.1 kn through the water. At 1045 a new fix puts you 322°T, 1.5 nm from Kittle water tank.

   Plot the 1045 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 0800 your fix is 027°T, 3.4 nm from Heron Point Light. You steer 105°T at 8.2 kn through the water. At 0850 a new fix puts you 047°T, 1.9 nm from Kittle water tank.

   Plot the 0850 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 1240 your fix is 250°T, 3.6 nm from Tern Island tower. You steer 125°T at 7.1 kn through the water. At 1320 a new fix puts you 238°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1320 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  

7. At 1425 your fix is 033°T, 3.0 nm from Heron Point Light. You steer 001°T at 8.2 kn through the water. At 1455 a new fix puts you 306°T, 4.0 nm from Tern Island tower.

   Plot the 1455 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  

8. At 0725 your fix is 241°T, 2.4 nm from Gannet Rock daybeacon. You steer 243°T at 6.6 kn through the water. At 0755 a new fix puts you 317°T, 1.7 nm from Mill stack.

   Plot the 0755 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