Nav 1 Finals (50 Items)

The statement is suggesting that the navigation record book should be kept neatly. This implies that there is a requirement for the book to be organized and maintained in a tidy manner. Therefore, the correct answer is true, indicating that the statement is accurate.

To establish a position accurately, using a landmark is necessary. Landmarks serve as reference points that help individuals determine their exact location. Without a landmark, it would be challenging to determine one's position accurately. Therefore, the statement is true.

The statement "time is usually expressed in four figures" is true. This means that when we typically express time, we use four digits to represent it, with two digits for the hours and two digits for the minutes. For example, 9:30 is expressed as 0930. This format is commonly used in various contexts, such as digital clocks, schedules, and timetables.

Duration is a measure of the length of time that an event or activity lasts. It is the amount of time that passes between the start and end of something. Therefore, time is the correct answer because it directly measures the duration of an event or activity. Distance, speed, and knots are not measures of duration as they are related to the physical distance traveled or the rate at which something is moving, rather than the length of time it takes.

The explanation for the given correct answer is that the course label indicates the true direction. This means that the course label accurately represents the direction in which something is moving or should be followed. Therefore, the statement is true.

The explanation for the correct answer, which is False, is that when writing the time, it can be written on either a 12-hour basis or a 24-hour basis. A 12-hour basis uses the AM/PM system, while a 24-hour basis uses a continuous count from 0 to 23. Therefore, the statement that "when writing the time, it is written on a 12-hour basis" is incorrect.

The characteristics of a successful navigator include alertness, good judgement, and being knowledgeable. However, being enthusiastic is not necessarily a characteristic of a successful navigator. While enthusiasm can be beneficial, it is not a defining trait for navigation skills.

Finding the range does not necessarily have to be done visually. There are various methods and techniques available to find the range of a set of data, such as using mathematical formulas, statistical analysis, or using software tools. Visual inspection may be one approach, but it is not the only way to determine the range.

The statement is false because the items to be recorded in the deck log are actually the important items, not the non-essentials. The deck log is a detailed record of the ship's activities, including navigation, weather conditions, communications, and any significant events or incidents. It is a crucial document for maintaining accurate records and ensuring the safety and efficiency of the ship's operations.

The statement suggests that time is not necessary to mark a fix, meaning that it is not essential to have information about the specific time when a fix is made. This implies that time does not play a crucial role in the process of marking a fix. Therefore, the correct answer is False, indicating that time is indeed an item of information that is essential to mark a fix.

When determining the speed by the use of a common log, the observer counts the knots in the log line being paid out. This statement is true because in traditional navigation, a common log is a device used to measure the speed of a ship. The log line, which is a rope with knots at regular intervals, is thrown overboard and allowed to run out while the ship moves forward. The observer then counts the number of knots that pass through their hands in a specific time period, which allows them to calculate the ship's speed.

The statement suggests that any defective instruments should not be repaired before a voyage to avoid delay. However, this statement is incorrect. It is crucial to repair any defective instruments before a voyage to ensure the safety and efficiency of the journey. Failing to repair defective instruments can lead to potential accidents or malfunctions during the voyage, which can cause significant delays or even endanger the lives of those on board. Therefore, the correct answer is False.

Another type of line of position (LOP) can be obtained by finding the range of a mark. This means that by determining the distance between a fixed point (such as a navigational mark or landmark) and the observer's position, a line of position can be established. This is a common method used in navigation to determine one's position on a chart or map. Therefore, the statement is true.

If a large cocked hat is formed, it means that the intersection of the lines of position creates a shape resembling a cocked hat. This indicates that there is a significant amount of uncertainty in the fix, and it is advisable to take another fix to improve the accuracy of the position determination. Therefore, the statement "if a large cocked hat is formed, you must take another fix" is true.

A course line is a line that extends in the direction of the course. It represents the intended path or route to be followed. It helps in navigation and ensures that the vessel or aircraft stays on track and reaches its destination efficiently.

To erase data on the deck log, you do not need to draw two lines. This statement is incorrect.

The velocity of a ship through the water is determined by its speed. Speed is the rate at which an object moves, and in this case, it refers to how fast the ship is moving through the water. Distance, time, and knot are not directly related to the ship's velocity in this context.

The correct answer is distance. Distance refers to the length travelled or made good by a ship in a particular direction. It is a measure of the total ground covered by the ship in a specific direction, regardless of the time taken or the speed at which it was travelling.

The statement is false because times of dead reckoning (dr) are not placed horizontally to the course line. Dead reckoning is a method of navigation where the position is estimated based on a previously known position, course, and speed. The times of dead reckoning are usually recorded vertically along the course line to track the progress of the vessel or aircraft.

The Dutchman's log is considered the oldest speed measuring device. It was used by sailors in the 17th century to measure the speed of a ship. The device consisted of a wooden board with a rope attached to it and a log or piece of wood at the end. The log would be thrown overboard and the rope would be let out for a certain amount of time. By counting the number of knots that passed through the sailor's hands during that time, they could estimate the ship's speed. This method was later replaced by more accurate and modern speed measuring devices.

A running fix is a position obtained by observing the movement of an object or landmark over a significant period of time. It involves taking multiple observations at different time intervals and then plotting these positions on a chart. By connecting these positions, a navigator can determine the direction and speed of their vessel, allowing them to estimate their current position. Therefore, a running fix is a position obtained by observation separated by a considerable time interval.

The statement is false because the variation, which refers to the difference between magnetic north and true north, is not found in the outer circle of the compass rose. The compass rose typically displays the cardinal directions (north, south, east, west) and may include additional directional markings, but it does not indicate the variation. The variation is usually indicated on a nautical chart or a separate chart called a compass rose variation diagram.

The given statement is false. Charts should be checked prior to embarkation, not disembarkation. Checking charts before boarding a ship or aircraft is important to ensure a smooth and safe journey.

The statement suggests that in order to reduce the error in taking a position, the Line of Position (LOP) should be cut at a small angle. However, this is incorrect. In reality, cutting the LOP at a larger angle can help reduce the error in taking a position. A larger angle provides a better intersection of multiple LOPs, resulting in a more accurate position fix. Therefore, the correct answer is false.

The explanation for the given correct answer is that when labeling the speed on the chart, it is not necessary to write it as a capital S on top of the course line. The speed can be labeled in any format or position on the chart, as long as it is clear and understandable. Therefore, the statement is false.

Dead reckoning position is the determination of position by advancing a known position for courses and distances. It involves calculating one's current position based on a previously known position, courses, and distances traveled since then. This method is commonly used in navigation when other means of determining position, such as GPS, are not available or reliable. Dead reckoning requires continuous updating and adjustment to account for factors like current, wind, and other navigational errors.

A "cocked hat" refers to a triangle formed by three position lines on a navigational chart. In this case, the position lines do not intersect at a single point, but rather form a triangle shape. This can occur when there is a significant amount of error or uncertainty in the measurements or calculations used to determine the position lines. The term "cocked hat" is often used in navigation to indicate a level of uncertainty in the accuracy of the position fix.

The statement is false because times of fixes are not placed at an angle to the course line. Times of fixes are actually placed on the course line to accurately determine the position of a vessel or aircraft.

The statement is saying that position lines should not be used if the angle of cut is less than 30 degrees. This statement is false because position lines can be used for any angle of cut, regardless of how small or large the angle is. Position lines are used to accurately position and guide the cutting tool, and they can be used for any angle of cut to ensure precise and accurate cutting.

The correct answer is 3,268 nautical miles north. This is determined by subtracting the latitude of the departure point (20 degrees 10 minutes south) from the latitude of the destination point (34 degrees 18 minutes north). The difference in latitude is 14 degrees 28 minutes, which can be converted to nautical miles using the conversion factor of 60 nautical miles per degree of latitude. Therefore, the difference in latitude is 14 degrees 28 minutes * 60 nautical miles per degree = 868 nautical miles. Since the destination point is north of the departure point, the answer is 868 nautical miles north.

Based on the given information, the MS Blue Eagle departed on February 28, 2010, at 0930 hours and traveled for a total of 16 days, 18 hours, and 48 minutes. Therefore, to determine the estimated time of arrival (E.T.A.), we need to add this duration to the departure time. Adding 16 days, 18 hours, and 48 minutes to February 28, 2010, at 0930 hours, the E.T.A. would be 0418 hours on March 17, 2009.

The intended horizontal direction of travel through the water is referred to as the course. It indicates the desired path or route that a vessel or object should follow while moving in the water. The course is typically expressed in degrees, such as north, south, east, or west, and is used for navigation purposes to ensure that the vessel stays on track and reaches its destination accurately.

A pitot static log utilizes a retractable rodmeter to measure the speed of the vessel. The pitot tube measures the dynamic pressure of the fluid flow, which is then combined with the static pressure to calculate the speed of the vessel. The retractable rodmeter allows the pitot tube to be extended or retracted as needed for accurate measurements. This log is commonly used in maritime navigation to determine the speed of a vessel through water.

This question is asking for a fix that can be obtained through different methods. The options provided are bearing and range, cross bearings, cross range, and bearing and speed. The correct answer is "bearing and speed" because obtaining a fix using bearing and speed is not a common method. Bearing and range, cross bearings, and cross range are all commonly used methods for obtaining a fix.

The correct answer is "semi circle." A semi circle is a half of a circle, resembling a "D" shape. In the context of the question, a "dr position" is not defined, but assuming it refers to a doctor position, a semi circle could potentially represent the medical symbol, which is often associated with the medical profession.

The distance traveled can be calculated using the formula: Distance = Speed x Time.
Given that the speed is 20.8 knots and the time is 16 days 18 hours 48 minutes, we need to convert the time into hours.
16 days is equal to 16 x 24 = 384 hours.
18 hours and 48 minutes is equal to 18 + (48/60) = 18.8 hours.
So the total time is 384 + 18.8 = 402.8 hours.
Now, we can calculate the distance by multiplying the speed (20.8 knots) by the time (402.8 hours).
Distance = 20.8 x 402.8 = 8,378.24 nautical miles.

The term "most probable position" refers to the estimated position that is considered to have the highest likelihood of being accurate. It takes into account various factors such as observed data, calculations, and probabilities to determine the most likely location. This term is sometimes used interchangeably with "estimated position" when referring to a position that is not exact but is the most likely approximation based on available information.

A fix position refers to the common intersection of two or more lines of position. It is the point where these lines intersect and provide a precise location or position. This term is commonly used in navigation or surveying to determine an accurate position on a map or chart.

The difference of longitude ("dlo") can be calculated by subtracting the longitude of the starting point from the longitude of the destination point. In this case, the longitude of the starting point is 140 degrees 02 minutes west, and the longitude of the destination point is 123 degrees 10.6 minutes east. To subtract these two values, we need to convert them to the same direction (either both east or both west). Since the starting point is already in the west direction, we convert the destination point to the west direction as well. Therefore, the difference of longitude is 140 degrees 02 minutes - 123 degrees 10.6 minutes = 016 degrees 51 minutes 24 seconds west.

The steaming time can be calculated by subtracting the departure time from the arrival time. The departure time is given as February 28, 2010, at 0930 hours and the arrival time is not provided. Therefore, the question is incomplete and an explanation cannot be generated.

A line of position refers to a line drawn on a chart that represents the position of a ship or aircraft based on a celestial observation or bearing of a known object on shore. It helps determine the vessel's location at a specific point in time. This line is used in navigation to plot the position of the vessel and can be combined with other lines of position to determine a fix position.

The difference of latitude is the distance between the starting latitude and the ending latitude. In this case, the starting latitude is 35 degrees 04 minutes 48 seconds south and the ending latitude is 38 degrees 12.4 minutes south. By subtracting the two latitudes, we can find the difference. Therefore, the correct answer is 187.6 nautical miles south.

The determination of position by estimating the course and speed expected to be made over the ground is referred to as the estimated position. This method involves using the current course and speed to project the position at a future time. It is commonly used in navigation when the exact position cannot be determined accurately, but an estimate can be made based on the expected course and speed.

An impeller log is a type of log that utilizes a rodmeter to measure the speed of a vessel through the water. However, instead of using mechanical means to transmit the speed indication, it uses an electrical means. This could involve using sensors or transducers to convert the mechanical motion of the rodmeter into an electrical signal that can be transmitted and displayed on a device or instrument.

A line with a single arrowhead is a line of position taken from a bearing. A bearing is a direction or angle between two points, and a line with a single arrowhead represents this direction. The arrowhead indicates the direction in which the line is pointing, which helps determine the position of the object or point being observed.

The difference of latitude is the change in latitude between the starting and ending points of the journey. In this case, the starting latitude is 35 degrees 04 minutes 48 seconds south and the ending latitude is 38 degrees 12.4 minutes south. To find the difference, we subtract the starting latitude from the ending latitude. The difference is 03 degrees 07 minutes 36 seconds south.

The correct answer is 5,807.4 nautical miles west. This can be calculated by finding the difference in longitude between the starting and ending points. The starting point is at longitude 140 degrees 02 minutes west and the ending point is at longitude 123 degrees 10.6 minutes east. To find the difference, we subtract the ending longitude from the starting longitude. Since the ending longitude is east and the starting longitude is west, we need to convert the ending longitude to west. This can be done by adding 360 degrees to the ending longitude. After calculating the difference, we convert it to nautical miles by multiplying it by the cosine of the latitude. The result is 5,807.4 nautical miles west.

The correct answer is 049 degrees 27 minutes east. This is because the ship traveled from a longitude of 158 degrees 02 minutes east to 152 degrees 31 minutes west, which is a total difference of 210 degrees 33 minutes. To convert this to the eastern direction, we subtract 180 degrees, resulting in a difference of 029 degrees 27 minutes. Since the ship traveled east, we add this difference to the starting longitude, giving us a final difference of 049 degrees 27 minutes east.

The correct answer is 54 degrees 28 minutes north. This is because the question asks for the difference of latitude, which is the change in latitude from the starting point to the destination point. In this case, the starting latitude is 20 degrees 10 minutes south and the destination latitude is 34 degrees 18 minutes north. To find the difference, we subtract the starting latitude from the destination latitude: 34 degrees 18 minutes - 20 degrees 10 minutes = 14 degrees 08 minutes. Since the destination latitude is north of the starting latitude, the correct answer is 14 degrees 08 minutes north.

The label for an estimated position is a small circle.