In article ,
Allen Thomson wrote:
Is there an estimate for how good a CEP one could expect these
days for a capsule with steerable lift like Apollo and Soyuz...

ESA's ARD demonstrator had a goal of landing within 5km of its target, and
in fact did so. That was with conventional parachutes, i.e. with no
maneuvering capability during final descent.

maybe some sort of parasail for final corrections?

If you're doing a land touchdown, it's highly desirable to have a
steerable parachute, for obstacle avoidance if nothing else. Using a
parafoil also offers the option of using a flare maneuver for final
deceleration. (Parachute touchdown velocities are a bit high without some
sort of final braking, unless you oversize the capsule to provide room for
a lengthy shock-absorber stroke.)

(Assuming that,
unlike the very scary recent Soyuz landing, things work right.)

There was nothing particularly scary about that landing. A bit unpleasant
for the crew, but no significant added risk.
--
MOST launched 1015 EDT 30 June, separated 1046, | Henry Spencer
first ground-station pass 1651, all nominal! |