Term
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Definition
| A line of position; A single observation that does not establish a fix but does mean that the ship’s position is somewhere along that line. |
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Term
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Definition
| After the LOP is drawn from a Navaid, a four digit time must be written above and parallel to the Line of Position. |
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Term
| Where do you get LOP's from? |
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Definition
| You can shoot a visual LOP, or get an LOP from a radar. |
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Term
| What is the most accurate type of LOP? |
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Definition
| A visual range LOP (when two known objects line up). |
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Term
| How are visual bearings measured? |
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Definition
| In any way, but they have to be converted to true before they can be plotted on the chart. |
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Term
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Definition
| The point where two or more LOP’s cross. This indicates the ship’s position on the chart. |
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Term
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Definition
| Use the four digit time next to the fix, it should be parallel to the bottom of the chart. The times of the individual LOPs are not written on each LOP. |
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Term
| What shape is a visual fix when plotted on a chart? |
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Definition
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Term
| What shape is an electronic fix when plotted on a chart? |
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Definition
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Term
| What shape is used to plot the ship's estimated position on a chart? |
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Definition
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Term
| What shape is used to plot the dead reckon position advanced from the previous fix on a chart? |
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Definition
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Term
| What is the optimum seperation of LOP's |
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Definition
| 1800 / number of LOP’s, for example if there are three LOP’s then optimum separation is 60 degrees. |
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Term
| How do you shoot bearings for bearing LOP's? |
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Definition
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Term
| How do you shoot bearings for range LOP's? |
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Definition
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Term
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Definition
the process of determining a ship’s approximate position by applying, from its last known position, a vector or a series of consecutive vectors representing the true courses steered and the distance run as determined by the ship’s speed and time, without considering the effects of wind and
current. |
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Term
| What are the 6 rules of dead reckoning? |
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Definition
| 1-Plot a DR Position Every Hour on the Hour. 2-Plot a DR Position at Every Course Change. 3-Plot a DR Position at Every Speed Change.4-Plot a DR Position for Every Line of Position (LOP). 5-Plot a DR Position for Every Fix or Running Fix. 6-Plot a new Course Line with Every Fix or Running Fix. |
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Term
| What is the 3 minute rule? |
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Definition
| The distance of travel of a ship in yards in three minutes is equal to its speed in knots multiplied by 100. |
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Term
| What is the 6 minute rule? |
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Definition
| The distance of travel of a ship in nautical miles in six minutes is equal to its speed in knots divided by 10. |
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Term
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Definition
| The vertical rise and fall of a body of water. |
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Term
| What is a Semidiurnal tide? |
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Definition
| two high and two low each day |
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Term
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Definition
| one high and one low each day. |
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Term
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Definition
| The horizontal movement of water, and classified as either tidal or non-tidal. |
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Term
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Definition
| A tidal current that flows toward shore as result of a rising tide. |
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Term
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Definition
| Tidal current that flows away from shore as a result of a falling tide. |
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Term
| What is the most notable of non-tidal currents? |
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Definition
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Term
| What does a current do to a ship? |
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Definition
| Causes the ship to depart from its DR. |
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Term
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Definition
The process of determining the
effect current has on your vessel and allowing for it when determining courses and speeds required to
correct or compensate for such currents (speed and direction). |
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Term
| What are the 2 main components of a current? |
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Definition
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Term
Which phase if used in voyage planning
to select a course to make good your desired track using an estimated current? |
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Definition
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Term
Which phase is used while navigating by
comparing the DR position to the position of the fix of the same time. Course and speed alterations are made based upon the calculated set and drift? |
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Definition
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