LOLLOL glars, that'll work just fine over level ground, but not so well in the canyons where they're up and down =)
Mino-
the RWR gear is to let you know when your aircraft has been 'hit' with a radar beam that is searching for you or trying to lock onto you for missle guidence. A radar altimeter uses radio signals to tell you your height above ground level, and is usually useless over about 2500ft agl