User's Manual Part 2

Operator Manual

Raytheon Marine GmbH

Germany

NSC 18

RADAR

3−17

3748DOC020102Edition: 14.JAN.2005

To determine accurate ARPA results, a number of past positions have to be

recorded. After acquiring a close target, the processor takes about a minute to

record enough position data to get a good, accurate speed.

More time could be required for targets more than eight miles away.

NOTE

For accurate target data, accurate own ship’s course and speed

are required, particularly during course changes. Sensor errors in

own ships course and speed will cause equal errors in target

data. Manual speed entries can be used, but for best perfor-

mance an accurate speed log is recommended.

A Ground Reference mode is provided to improve speed mea-

surements. A small, fixed, stable target is plotted to give a zero

speed reference. Target positions and own ship’s position may be

referred to the Reference Target. The use of a suitable reference

target will improve motion stabilization and target data.