The CPA (Closest Point of Approach) alert
functionality was developed to avoid
collisions due to low visibility at night or bad
weather conditions.
You can create your own “safety area”
around your vessel by activating time- and
distance settings.
Usually CPA settings are set at the chart
plotter. But the chart plotter has to be switch
on all the time during the trip to keep the
CPA functionality running. This might cause
to a power supply problem aboard because
chart plotters often need a lot of power. But
during a long-term-trip it is absolutely
needful to reduce power consumption to a
minimum.