In general, a person who provides visual information
for another persons use. Spotter
s are extremely important for artillery
. In WWI
s were able to do terrible damage by using early airplanes as spotters. When the troops saw a plane pass over they would immediately brace for the coming explosion. A person who calls in an aerial bombardment
can also be considered a spotter
Also, a person who helps another person to exercise. This generally consists of helping the person out if their strength fails . Like stopping weights from crushing a lifter, or stopping someone from breaking a leg by falling off gymnastic equipment.