Hi Graham,
Just to follow up on Peters posting ....
Firstly I need to invent some terminology here, so here goes, we have two types of air traffic:-
precise trafficTraffic which includes full location details in addition to information regarding speed, track and identification.
This would consist of ADS-B & P3I traffic returns
imprecise trafficTraffic which includes partial or missing location details consists of Mode-A, Mode-C and Mode-S transponder returns. To be even more detailed, we have no
accurate method of distinguishing between a Mode-A and Mode-C return, because to the passive receiver, they appear exactly the same, but their encoded meaning is significantly different, namely squawk or altitude.
(for more information try googling Transponder FRUIT)
For
precise traffic, we have everything we need in order to accurately and definitively provide audio and visual prompts to the user, and we can control when those audio prompts occur. For example the audio alerts occur by intrusion into 3 zones
10KM +/-2000ft
5KM +/-1000ft
3KM +/- 500ft
So as you can see, there are no
precise traffic warnings for traffic at 75 miles
For
impreceise traffic warnings, this is more art than science, and this is something Peter and Alan have been experimenting and advising to come up with the most suitable settings (as detailed in his previous posting)
The settings for
imprecise traffic warnings are under user control, so please take advantage of these settings including the sensitivity and the separation parameters, for example the 30,000ft separation is only useful for testing purposes, a more realistic setting I would say is 1000 ft
Thx
Lee