Garmin G1000 Cockpit Reference Guide for Cessna Nav III 23SECTION 2 – PFDHorizontal Situation Indicator (HSI)ARC HSIThe Arc HSI is a 140˚ expanded section of the compassrose. The Arc contains a course pointer arrow, TO/FROMindicator, sliding deviation indicator (the TO/FROM andsliding deviation indicator are one in the same), and devi-ation scale. Upon station passage the arrowhead flips andpoints to the tail of the aircraft just like the conventionalTO/FROM flag. Depending on the source of navigation,the CDI on the Arc HSI can appear a couple of differentways:• GPS,OBS,VOR – appears as a arrowhead• Localizer – appears as a diamondNOTE: If the pilot makes a heading changegreater than 105˚with respect to the course, theCDI switches to the opposite side of the deviationscale and displays reverse sensing.Lateral DeviationScale Course DeviationTO/FROM IndicatorFigure 2-11 ARC HSINOTE: When the Arc HSI is displayed, the BRG1and BRG2 information windows are disabled.Heading IndicationA digital reading of the current magnetic heading ap-pears on top of the HSI. A rotatable heading bug on thecompass rose and arc marks the desired heading.Figure 2-12 Current HeadingThe selected heading appears in a box left of the lubberline, next to the HSI. The color of the digital readout iscyan (light blue).Figure 2-13 Selected Heading BoxThe selected course appears in a box right of the lub-ber line, next to the HSI. The color of the digital readoutappears in magenta if the navigation source is GPS, orgreen if navigation source is NAV1 or NAV2.Figure 2-14 Selected Course BoxNOTE: The heading displayed on the HSI is alwaysmagnetic, even if the NAV ANGLE is set to ‘TRUE’in the AUX System Setup Page on the MFD.
