i=:insideSafeZone :Safezone_B=i
if i then :Safe_C=2 else :Safe_C=1 end
if i then :Tran_C=2 a=0 b=0 else :Tran_C=1 a=1 end
if(not b)*a then :transponder=0 b=1 end
if(not a)*b then a=0 end goto1

// No new button names.  Auto turns off transponder if cross into
// unsafe.  Sets the rectangular button colors based on unsafe.
// will allow transponder to be turned back on manually if desired
// in unsave.