Difference between coupled ILS and GPS approaches
In case it helps anyone else, this is what I have learned.
ILS (land based approach):
There are TWO things you have to do during ILS approach that is NOT needed during GPS approach:
1. Once the ILS approach is selected and loaded, the ILS frequency is put into the standby window. You have to switch this to the active window The needles should turn to green on the HSI.
2. On the go around using the TO/GA button, the command bars is pitched up (5 degrees in my setting), the plane will pitch up to follow the command bars. Here is the catch. At the same time the the NAV function is deactivated. YOU HAVE TO PUSH THE NAV BUTTON to make it follow the missed approach. The missed approach on an ILS is GPS driven.
Any altitudes that is shown in the missed approach sequencing will be followed by the AP. The final altitude is not shown and should be set in pre-select window.
On both types of approaches, once the GS (ILS) or GP (GPS) is armed, the altitude pre-select window at the top of the altitude tape can be set to the missed approach altitude.
Setting the DA or DH (touch center of HSI or push MENU once) into the Baro MIN window also sets a pointer (CYAN) on the altitude tape that will come into view from the bottom of altitude tape as that altitude approaches. This a very handy tool to show DA approaching without number crunching. There is also an audio "minimums", but I am not sure if this is driven by the Baro MIN setting or from the published minimum.
Hope it helps someone.
2017 dues paid with a smile