speed warning


this is my requirement

i have a garmin c320 .. i want to use it as a speed warning device either in one of the following two ways

#1 Predefine 3 threshold speed limits in the system say 30/ 40/50

any time i cross the threshold the deviec should give an audible beep informing that the speed has gone over a certain threshold.

#2 since the device already has the speed limit of roads whenever my speed is say 10 miles over the road speed limit, give an audible warning

is it possibe..

thank you ..