78Detailed OperationChartViewAirport Surface ChartsAirport surface charts provide a graphical presen-tation of the airport surface area (runways, taxiways,buildings, towers, and other objects), within theimmediate airport vicinity.Selecting a Surface ChartFrom either the Custom Map or the IFR en routeMap, airport surface charts will automatically beloaded and displayed as an overlay if the followingconditions are met:• The airport surface chart is within the loadeddatabase• The airport surface chart is geo-referenced• Airport Chart menu layer is turned on• The aircraft position is within the coverage of thechart• A loaded approach chart is not being “flown”In typical operation, the above conditions are metwhen the unit is turned on, meaning that the airportsurface map is displayed as soon as GPS position isacquired. Note that the Initial Zoom Scale featuredetermines the initial zoom scale that is set when theaircraft is on the ground, which is important whenworking with surface charts.Viewing Surface ChartsThe airport surface charts are treated similarlyto approach type charts in that they can be viewedthrough both the ChartView Function and on theCustom Map/IFR Map as an overlay. However, as thereis only one unique surface chart for a given airport, itdoes not need to be manually loaded for display. Thenearest available airport surface chart will always beused. When viewed from the ChartView Function, theairport surface chart shows up as the first availablechart for the selected airport of interest. Thus, afterselecting the airport of interest, the list of charts willhave an “Airport” entry as the first item in the list. Aswith standard approach charts, when viewed from theChartView Function, the aircraft’s ownship position isnot shown on the airport surface chart.Viewing Surface Chart DetailIf an approach chart is currently loaded and beingdisplayed (aircraft is in the air), it will take priorityover displaying the airport surface chart. Once theaircraft touches down and the speed drops below theair/ground transition speed, it is assumed that a missed
