Garmin G1000 Reference Manual

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Garmin G1000 Reference Manual Manual pdf 24 page image

Garmin G1000 Cockpit Reference Guide for the Cessna Nav III 190-00384-09 Rev. A1-10SECTION 1SYSTEM OVERVIEW1.5 VERTICAl NAVIGATIONOne of two altitude sources is used by the G1000 whengiving vertical navigation guidance. WAAS GPS altitudeis used when giving guidance for a WAAS approach afterthe Final Approach Fix. Baro corrected altitude is usedwhen vertical guidance is given in all other situations andin non-WAAS systems.The G1000 system can use altitude constraintsassociated with lateral waypoints to give guidance forvertical navigation. These altitudes are, depending on thespecific instance, entered by the pilot or retrieved from thepublished altitudes in the navigation database.The navigation database only contains altitudesfor procedures that call for “Cross at” altitudes. If theprocedure states “Expect to cross at,” then the altitudeis not in the database. In this case the altitude may beentered manually.NOTe: All arrival procedure altitudes contained inthe navigation database are for turbojet aircraft only.Alter or enter altitudes as desired to comply with theATC clearance.When activating or loading an arrival or approachprocedure into an active flight plan, the VNV ‘ALT’ fieldsare populated with any altitudes that can be retrievedfrom the navigation database.Since altitudes loaded with an arrival procedure arepublished only for turbojet aircraft, the altitudes aredisplayed as white text indicating that the altitudes aredisplayed for reference only. An arrival waypoint altitudemay be used (or “designated”) as is, or changed to adifferent altitude. An altitude is designated by pressing theFMS Knob and turning the large FMS Knob to place thecursor on the desired altitude and pressing the ENT Key orentering a different value and pressing the ENT Key. Thealtitude is now displayed as light blue text, indicating thatthe altitude is now designated to give vertical speed anddeviation guidance.Approach waypoint altitude constraints are automaticallydesignated when the approach is loaded. These altitudesare also displayed as light blue text. Waypoint altitudeconstraints are designated up to, but not including the FAF.The FAF is always a “reference only” altitude and cannot bedesignated, unless the selected approach does not providevertical guidance. In this case, the FAF altitude can bedesignated manually.Altitudes that have been designated for use in verticalguidance may also be made “non-designated” by placing thecursor over the desired altitude and pressing the CLR Key.Other displayed altitudes may change due to re-calculationsor rendered invalid as a result of manually changing analtitude to a non-designated altitude.To help interpret the meanings of how the altitudes arepresented, keep the following points in mind:• When the altitude is displayed in light blue,the system is using that altitude (designated) todetermine vertical speed and deviation guidance.• When the altitude is displayed in white, it is not beingused by the system (non-designated) to determinethe vertical speed and deviation guidance.• An altitude displayed as small text is an altitude thatis published in the navigation database.• Altitudes displayed as a light blue subdued textcannot be used in the current vertical navigationcalculations.Refer to Figure 1-8 and Table 1-1 for more detailregarding the significance of text size and color.