Lost Helicopter

A helicopter was flying around above Seattle yesterday
when an electrical malfunction disabled all of the
aircraft's electronic navigation and communication
equipment. Due to the clouds and haze the pilot could
not determine his position or course to steer to the
airport. The pilot saw a tall building, flew toward it,
circled, drew a handwritten sign and held it in the
helicopter's window. The sign said "WHERE AM I?" in
large letters.

People in the tall building quickly responded to the
aircraft, drew a large sign and held it in a building
window. Their sign said, "YOU ARE IN A HELICOPTER."
The pilot smiled, waved, looked at his map and
determined the course to steer to SEATAC (Seattle/Tacoma)
airport and landed safely.

After they were on the ground, the co-pilot asked the
pilot how the "YOU ARE IN A HELICOPTER" sign helped
determine their position.

The pilot responded, "I knew that had to be the
MICROSOFT building because they gave me a technically
correct but completely useless reply.