Vertical: "GS" will be in white letters and the autopilot will be waiting to intercept the Glide Slope. Once the localizer is within one dot of deflection, it will switch the current nav on the CDI to LOC (green needles) and track the localizer. Lateral: If the localizer is being received by the nav radio, "LOC" will be in white letters to the left of the current lateral AP mode. When the flight path intercepts the glide path, GP will slide to the left and become the active (green) vertical mode and the AP will follow the GP irrespective of selected altitude. Vertical: "GP" will be in white letters and the autopilot will be waiting to intercept the Glide Path. I'm not sure what it will do if the current lateral mode is HDG. Lateral: GPS is probably already active with the magenta needles in the CDI. What will be in standby and how it proceeds depends on the approach as follows: "APR" on the autopilot panel puts a lateral and vertical mode in "standby" in white letters, with the lateral mode to the left of the current lateral mode and the vertical mode to the right of the current vertical mode. The ILS or VOR need not be the currently selected nav source (i.e., Nav1 or Nav2) in the CDI. If the approach is an ILS or VOR, both "Activate" and "Load" will load the ILS/VOR frequency into the active position of the currently selected Nav radio and load the final approach course into the Course of the selected NAV radio. This is what APR does on my G1000NXi system with WAAS. Long answer varies depending on the G1000 era. On older models waypoints before the FAF will not be loaded. If you select VTF (vectors to final), the active waypoint will be the FAF. "Activate Approach" in the MFD loads the waypoints, frequency and nav course (if ILS/LOC or VOR) for the approach and makes the first waypoint the active waypoint. Loading a second approach while the first approach is otherwise active will replace the currently active approach. If the waypoint is the last in an approach (e.g., MAHP), another approach may be loaded and its waypoints will be inserted after the last waypoint of the previous approach. Later on you can select the desired active waypoint and use Direct To or Activate Leg (soft key or menu item) to make that waypoint the active waypoint. "Load Approach" will load the approach waypoints, nav frequency and nav course (if ILS/LOC or VOR), but not change the active waypoint. Load/Activate approach on the MFD controls the flight plan and flight director.
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