Radar and ARPA Manual

APRA-ADDITIONAL FACILITIES 227

5.5.4.2

For

a faster

observing

ship

When the observing ship is the faster, the circle of colli-

sion points lies on the target side of the equal-speed

locus.

As the aspect increases, the collision point moves

farther away from the observing ship. There is no

limiting aspect and collision is always possible.

An interesting point to note in Figure 5.10 is that the

inverse of the idea of a limiting aspect to the slow

observing ship appears when the observing ship is faster;

this is effectively a limiting course for the observing ship.

If the actual heading is to the remote side of this line, all

collision points