Furuno FR-1500 MARK-3 Series User Manual page 93

Problem
Poor discrimination in range
True motion presentation not
working correctly
Target nottracked correctly
Probable causes or check
points
1 Sea clutter control not
functioning properly
1 Poor contact of MODE
key
2 Selection not accessed
3 Speed entry incorrect
4 TM display inaccurate
1 Poor definition of targets
in sea clutter
-6.5-
Remedy
1 Improper setting of A/C SEA control. If
A/C SEA is seen only at very close
range, suspect inaccurate frequency of
reference oscillator.
1 Try to press MODE key a little harder.
2 Press MODE key until TM appears.
3 Enter correct own ship speed adequately
4 Make sure that speed and compass
inputs are accurate.
1 Adjust A/C SEA and A/C RAIN controls
adequately.