Originally Posted by
AdamFrisch
Primary radar has bad accuracy in altitude. It has many blank spots and gives returns on anything from birds to kites etc and it suffers from clutter, interference, noise etc. It's not a very accurate tool (in altitude at least) and that's precisely why they came up with secondary (SSR) radar, i.e. the transponder that answers back with vital altitude information (that, by the way, can also be rigged by feeding the SSR system the wrong info, if one was so inclined).
UK AIP ENR 5-3-2-3 refers.
Doubtless there will be some additions between now and Olympageddon, or the whole section might just...
(performs hand gesture used by Verbal Kint when describing Keyser Söze)
...disappear.
