Like the others I have come to the opinion that the current portable
traffic alerts don't have the power (or the position info) to do more
than alarm me, though knowing the altitude might be helpful... Near
airports where there are many transponders the unit is often of no
value.... I have decided not to use one at this time... What I have
seen is folks who become dependent upon the gadgetry to the point of
compulsion ( not that you will or would)...

denny