(Reference AIM 1-1-3f). Magnetic heading will usually require a correction based on the variation or: The angular difference between true north and magnetic north from any given position on the earth's surface (represented by isogonic lines), Isogonic lines are points of equal variation, represented in degrees east or west, Deviations is usually pulled off a sectional chart however, other sources such as, The memory aide "east is least (minus), west is best (plus)" is often used to remember how to apply east and west variations, Magnetic Course (MC) = True Course (TC) - East Variation, Magnetic Course (MC) = True Course (TC) + West Variation, All aircraft will have a deviation factor that must be applied, Deviation is read off the compass card in the aircraft, and must be added or subtracted to the magnetic course as appropriate, Determining winds at altitude help guide your true heading, Since winds aloft are expressed in "true," you will calculate the wind correction angle off true course, Deviation is found on a placard with your magnetic compass, Variation is necessary for converting true headings to magnetic, Magnetic variation depends on your location on the earth, as labeled by isogonic lines, Compass heading is determined by applying the deviation correction to the magnetic heading, From Sea Level to 5,500' we calculate 9 minutes, 2.0 Gal, 13 NM, Assuming 1,000' for the departure altitude we calculate: 1 minute, 0.4 Gal, 2 NM, Subtract the difference: (9-1)=8 Min, (2.0-0.4)=1.6 Gal, (13-2)=11 NM, Pay attention to the notes at the bottom of the chart, especially to add 1.1 Gal for taxi and takeoff, Utilizing a simple formula (Distance = Time x Ground Speed may be utilized, Therefore, if you have any two, you can calculate the other. As a safeguard, the FAA requires that aircraft navigation databases hold only those procedures that the aircraft maintains eligibility for. Airway & Route Course Navigation - CFI Notebook This means that your aircraft may be eligible for RNP 1 operations, but you may not fly an RF turn unless RF turns are also specifically listed as a feature of your avionics suite, RNP 2 will apply to both domestic and oceanic/remote operations with a lateral accuracy value of 2, RNP 4 will apply to oceanic and remote operations only with a lateral accuracy value of 4, RNP 4 eligibility will automatically confer RNP 10 eligibility, The RNP 10 NavSpec applies to certain oceanic and remote operations with a lateral accuracy of 10. Is time lost fighting a headwind gained back when riding a tailwind? Pilots are required to use SBAS to fly to the LPV or LP minima. At the alternate airport, pilots may plan for applicable alternate airport weather minimums using: Lateral navigation (LNAV) or circling minimum descent altitude (MDA); LNAV/vertical navigation (LNAV/VNAV) DA, if equipped with and using approved barometric vertical navigation (baroVNAV) equipment; RNP 0.3 DA on an RNAV (RNP) IAP, if they are specifically authorized users using approved baroVNAV equipment and the pilot has verified required navigation performance (RNP) availability through an approved prediction program, If the above conditions cannot be met, any required alternate airport must have an approved instrument approach procedure other than GPS that is anticipated to be operational and available at the estimated time of arrival, and which the aircraft is equipped to fly, This restriction does not apply to TSOC145() and TSOC146() equipped users (WAAS users), The low-strength data transmission signals from GPS satellites are vulnerable to various anomalies that can significantly reduce the reliability of the navigation signal.
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