planes appear to land not on the airport ?

[wojteksz]

Hello to everyone,
I am new to airnav and trying to cover the gap in the center of Poland ;)
temporarily working with the default antenna not perfectly located but covering the planes landing on Warsaw Okecie airport EPWA at least down to some FL100. Unfortunately it seems that the planes align with the runway located a few mile west from the original airport location ( i see them flying perpendicular to the direction of active runway, descending and slowing down - so must be loading!). Yet the position is definitely wrong  - i have checked the outline of the airport against Google Earth and confirmed that the outline is correct.
How can i compensate this?

[DaveReid]

How can i compensate this?

You can't.

Some aircraft, for example many 767s and older 737s, send position data that's based on inertial navigation systems, which are subject to drift, rather than GPS, which isn't.

[wojteksz]

Dave,
thanks, seems i have to learn to live with it ;)
i have also noticed that sometimes the plane track gets somehow backed by some 1..2 miles. What could be the reason?

[Runway 31]

wojteksz, what version of the softare are you using?

Alan

[DaveReid]

i have also noticed that sometimes the plane track gets somehow backed by some 1..2 miles. What could be the reason?

Same reason, INS drift isn't necessarily lateral, it can just as easily have a component along track, in either direction.

[wojteksz]

Alan
i am using radarbox 4.03 with the standard antenna installed outdoor (hope it will survive out there untill a proper outside antenna will arrive ;))
Wojtek

[AirNav Support]

Sir,

We seriously advise not to use your antenna outdoors for a long period of time. It should only be used outside as mobile sites (visiting the airport etc..)
The antenna is not designed to withstand the elements.

Also please read

http://www.airnavsystems.com/forum/index.php?topic=2759.0

[wojteksz]

Support
i know, i know...
my newly ordered 1090 WiMo outside antenna set is on its way ;)
i just could not wait to see the planes flying so took the antenna from the window and installed (?) it on the nearest roof edge. Somewhat not perfect location but gives in best direction over 120mi range.

[wojteksz]

got the new antenna installed and running temporarliy on the laptop - better round reception much more planes observed ;)