The
notes quote an accuracy value agreed with the UK CAA and taken from a pre-JAR
textbook. Unfortunately the French didn't read the same textbook and their view
of accuracy was based on a different system. Everything about the question except
the accuracy ties in with the text, low altitude rad
alts are FM, they (usually) operate between 0 and 2500ft, use continuous wave
(CW) not pulsed signals and have an operating frequency range between 4200MHz
and 4400MHz.
One can't complain about the French accuracy statement because it's actually
more representative of a modern aircraft than the old CAA figures, even more
representative figures would be +/- 1 ft in the first 1000ft.