Personal comments:
You have to conform to the approach fix altitudes, which means using a reliable Approach Plate, or something that can read the NavData and display the approach both graphically and in tabular format (i.e., Navigraph + Little Nav Map). Do not rely on ATC to give you the necessary fix alt - if needed, one workaround is to subtract 100 feet from the FAF alt fix (to account for Baro variances if using Live Data), and you will capture it 8 out of 10 times. Until VNAV can be implemented (WT To-Do list) fully across the main Garmin Nav Units, most of us have to dial in and make sure we’re hitting the fix alt on time.
