FURUNO
FAR-21x7(-BB)/28x7 SERIES
SP - 4 E3519S01C-M
Precautions for high speed targets
Assume your ship is making 40 kt and a target ship is approaching at 49 kt right toward you. Then
the relative speed is 80 kt. With the antenna rotating at 42 rpm, the target blip appears jumping to a
new location 59 m nearer. This jump corresponds to 19 mm on the display using the 0.25 nm range
scale. On such a short range you may lose the track of a target in the midst of sea clutter, random
noise or other targets. Use one step larger range scale.
ARPA can fail to track a target when the relative speed exceeds 100 kt.
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