Compass correction/deviation card. A small card placed in the cockpit to show the compass deviation for each heading. The card reads the courses to be steered in lieu of the required headings . Also called a deviation card.
Is a compass correction card required?
So, the compass correction card is still required under the 23.1547 . SkyDog58 likes this.
How do you use a compass deviation card?
Drive down that transit , pointing the heading down the transit line. Allow for Variation to obtain magnetic heading and then the difference between the compass heading and the transit’s position line, allowing for variation to obtain a magnetic bearing, is deviation on that heading.
Where is a compass calibration card found?
ANSWER: The compass calibration requirements for small aircraft (less than 12,500 lbs maximum take-off weight) can be found in FAR’s 23.1327 and 23.1547 . The compass calibration requirements for large aircraft (more than 12,500 lbs maximum take-off weight) can be found in FAR’s 25.1327 and 25.1547.
What is Compass deviation card?
noun. a card, sheet, or the like, with two compass roses printed on it concentrically, for recording, on a given voyage, the amount of deviation for which the navigator must compensate in using the ship’s compass to steer a magnetic course .
Can a compass be calibrated?
In other words, you can calibrate your compass any time the magnetic field sensor is being used just by waving your phone – there is no “calibration mode” .
When an aircraft altimeter is set at 29.92 hg on the ground the altimeter will read?
When an a/c altimeter is set at 29.92′′Hg on the ground, the altimeter will read? Pressure Altitude .
How long is a compass deviation card valid for?
Check that there are no liquid leaks around seals or any filler plugs. Finally, according to ISO 25862: 2009 “Ships and Marine Technology”: All SOLAS vessels should have their compass adjusted and at maximum every two years to issue a new deviation card.
What is the purpose of correcting compass?
“Correcting” is converting a magnetic (M) direction to true (T) . “Un-correcting” is converting from true to a magnetic direction. “True” direction is relative to true north (north pole). Deviation is the failure of the compass to point to magnetic north.
What causes variation in a compass?
Fluid iron in the earth’s core acts like a huge magnet, creating a relatively weak magnetic field. The needle in a compass is magnetised and freely suspended , and it aligns itself with the earth’s magnetic field. This difference between true north and magnetic north is known as variation.
How do you compensate a compass?
Compensating a compass consists in adjusting the position of the 2 magnets , in order to affect the horizontal component of the card by modifying the North/South and East/West deviation. Use a second compass as the reference ; a handbearing compass is often the most convenient, provided it is interference-free.
What is a master compass?
[′mas·tər ′käm·pəs] (navigation) That part of a remote-indicating compass system which determines direction for transmission to various repeaters .
What fluid is used in an aircraft magnetic compass?
Some compasses are field-refillable, but save the Jack Daniel’s for your own consumption. Alcohol (hence the whiskey compass designation) was used at one time, but now kerosene or aliphatic naphtha is used. The correct fluid is MIL-C-5020A .
What causes compass deviation?
Deviation is caused by the effect of magnetic fields generated on board the vessel (such as the engine block) , whereas variation is generated regionally by local effects (for example large areas of granite in the earth’s surface).
What is Gyro Compass Error?
Errors. A gyrocompass is subject to certain errors. These include steaming error, where rapid changes in course, speed and latitude cause deviation before the gyro can adjust itself . On most modern ships the GPS or other navigational aids feed data to the gyrocompass allowing a small computer to apply a correction.
When changing from a compass course to a true course you should apply?
To convert a compass course into a true course we can use the original equation . If we have steered a compass course of 200°, we have to plot a true course of 203° in the chart if the variation is 3° East , or a true course of 190° if the variation is 10° West .
