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NABOB MARS III Passing at a Given Distance

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500 x

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Passing at a Given Distance A contact bears 300 at 15 nm. His course is 060 at 16kts. You are to pass ahead of this contact at 5 nm. A contact bears 300 at 15 nm. His course is 060 at 16kts. You are to pass ahead of this contact at 5 nm. Available speed is 20 kts. Available speed is 20 kts. What is the course to steer? What is the course to steer? When will the contact be 5 nm away? When will the contact be 5 nm away?

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Select appropriate scale Distance 2:1Speed 2:1Plot the contacts course and speed Plot the contacts initial position Indicate the desired range Draw the contacts relative track vector Note: the contact passes astern of you at 5 nm

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Distance 2:1Speed 2:1 Transpose the contacts relative track onto the relvel triangle Complete the relvel triangle by drawing your course and speed vector to where the relative vector meets with your stationing speed Course to steer 012

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Distance 2:1Speed 2:1 Course to steer 012 Determine when the contact will be 5 nm from you. This happens when its compass bearing is perpendicular to its relative track Time (hr) = Distance (nm) / Speed (kts) Distance 14.3 nm Speed 15 kts Time (hr) = 14.3 nm / 15 kts Time = 0.953 hrs or 57 mins 12 secs

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Passing at a given distance Contacts course and speed 200 at 9 kts Contacts course and speed 200 at 9 kts Contacts position 000 at 10 nm Contacts position 000 at 10 nm Pass on the guides starboard side at 5 nm using 18 kts Pass on the guides starboard side at 5 nm using 18 kts What is your course to steer? What is your course to steer? How long will it take to reach 5 nm? How long will it take to reach 5 nm?

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Passing at a given distance Contacts course and speed 310 at 11 kts Contacts course and speed 310 at 11 kts Contacts position 130 at 3000 yards Contacts position 130 at 3000 yards Pass on the contacts port side, coming to a range of 1500x and using 20 kts Pass on the contacts port side, coming to a range of 1500x and using 20 kts What is your course to steer? What is your course to steer? How long will it take to reach 1500x? How long will it take to reach 1500x?

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