Radio Altimeter
Aircraft equipment which makes use of the reflection of radio
waves from the ground to determine the height of the aircraft above
the surface.
NASA JPL Education
Site
The Education home page for NASA JPL is the perfect place for
parents and teachers to find activities for a budding rocket
scientist, engineer, technician, or any kid that dreams of
going to space.
"Not the sharpest pencils in the box, these Washington
state legislators..."
Source: From the ANN analysis of proposed
legislation that would impose a .5% tax on aircraft in the State of
Washington... and in which the money would be given to the general
fund and not the State DOT.