Launchbury wrote on Dec 31^st, 2009 at 6:23am:

Rates of descent over -1000fpm below 1000ft AGL are prohibited.

LOL I am in a heap of trouble then  :o

Frankly I just matched it to the other sinkrate numbers in the section...didn't think too much about whether it made any sense!

Anybody wanting realistic GPWS warnings should change the descent rates to reflect Launchbury's earlier in this thread:

[GPWS]
max_warning_height         =  1200
sink_rate_fpm              = -1500
excessive_sink_rate_fpm    = -2000
climbout_sink_rate_fpm     = -1000
flap_and_gear_sink_rate_fpm= -1000

Regardless, here's wishing everyone a "Granite Cloud Free" New Year!
Thanks!