Updated 2/20/08 Just some info on the Mark Location Feature:
Mark Location Feature is for speed traps & cameras. Good for those traps set up on your
"not so frequently" driven rides where LEO's use I/O. the verbal notification of the mark out circumference is 1/2mi under 50mph and 1mi over 50mph, So if you drive on road parallel it will still alert you. It will also count down in feet to the mark location and away from it.
The 9500I will not mark a location when its receiving a signal (safety idea). However the 1 real KA speed trap i encountered I was able to Mark the location 500-800ft passed him wen the signal went away. Because the Mark location radius is pretty big (1mi & 1/2mi) i see no big problem.
If it is a speed trap (LEO's frequent that spot) you will have many chances to Mark the location so come back another time when LEO is not using radar or not in that location. Or mark it just after the alert, Mark location does have a good radius.
A good place I use mine for is a speed change from 55 to 25mph on my trip to my place in Vermont.
[Note] The 9500I should be powered down at some point after marking a location to save/confirm.