Worksheet 815 · Skill 5

Set and drift

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1. At 1040 your fix is 233°T, 1.3 nm from Tern Island tower. You steer 330°T at 6.0 kn through the water. At 1110 a new fix puts you 295°T, 2.3 nm from Tern Island tower.

   Plot the 1110 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  

2. At 1500 your fix is 070°T, 1.3 nm from Heron Point Light. You steer 002°T at 5.4 kn through the water. At 1555 a new fix puts you 040°T, 2.7 nm from Westfield church spire.

   Plot the 1555 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1310 your fix is 204°T, 1.7 nm from Tern Island tower. You steer 172°T at 4.0 kn through the water. At 1400 a new fix puts you 035°T, 2.3 nm from Mill stack.

   Plot the 1400 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 0810 your fix is 266°T, 1.8 nm from Gannet Rock daybeacon. You steer 267°T at 5.5 kn through the water. At 0855 a new fix puts you 033°T, 3.6 nm from Heron Point Light.

   Plot the 0855 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  

5. At 0840 your fix is 162°T, 1.6 nm from Westfield church spire. You steer 047°T at 4.8 kn through the water. At 0920 a new fix puts you 273°T, 3.4 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1025 your fix is 044°T, 2.8 nm from Heron Point Light. You steer 139°T at 4.0 kn through the water. At 1120 a new fix puts you 054°T, 2.3 nm from Mill stack.

   Plot the 1120 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1250 your fix is 252°T, 1.6 nm from Tern Island tower. You steer 200°T at 6.9 kn through the water. At 1325 a new fix puts you 358°T, 2.6 nm from Mill stack.

   Plot the 1325 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 1030 your fix is 069°T, 2.7 nm from Heron Point Light. You steer 338°T at 4.6 kn through the water. At 1130 a new fix puts you 062°T, 3.7 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn