Lee, Thanks for the explanation. I have just done a bit of testing. By default the Mode-S Select is set to 'none'. Users need to be advised that this will turn off the Mode-S detection. So to get back to what they had before they need to set it to 'Mode-S' until the additional functions are available.
Richard, the link works for me on the latest version.
Hi Ian,
Due to the fact that detection and display of 'bearingless' targets is more complex and requires direct pilot action, i.e. active selection of detection range - which requires an understanding of how the system works, the experience to decide the most appropriate range for your current flying environment, and a clear understanding of the use of physical lookout to 'find' the reported aircraft. Mode S was therefore set to 'off by default' to allow new PAW users to get to know the system before deciding when and how they wish to use the Mode S 'option'.
Selection of detection range is of significant importance. Too long in a busy environment and you will receive constant alerts which can cause distraction and if the contacts are not 'found' can cause the user to start disbelieving the warnings (which are in fact always real, but probably came from a high power CAT transponder far too far away to be a risk - full 360 degree physical lookout up/down or level as advised by the relative altitude confirms this and allows it to be disregarded, unless it continues to approach). Too short on the other hand and you might not get that critical warning until it might be too late.
I agree that it would be beneficial if these settings once decided by the pilot were retained during update, or if not practicable, a warning to this effect needs to go in the Operating Manual. In any case it is important if using Mode S to recheck settings before each flight if your environment is likely to change.
Regards
Peter
