3engnever wrote:
What does it use to calculate the AP?
By default, the winds specified for the trail. If preferred, the user can enter a mean wind velocity to be used for the track to each abort aerodrome.
The 'ETA at current GS' on-chart tool is only really of use for
quick ROM estimates for emergency diversions. But it can be used for other purposes as required. It is not a formal part of mission planning. As for the 100kt wind, well, as soon as the formation is heading towards the target the revised GS will of course provide a more accurate ETA. Originally it only provided brg and dist, but an ex-AARC suggested inclusion of the ETA at current GS feature. I stress, it is a very minor part of the system and isn't often used.
The A310 system has been in operational service for over 5 years now. The primary users are well satisfied with it and will no doubt be even happier with the additional functionality the forthcoming upgrade will provide for them.