vesper marine WatchMate 650, Руководство пользователя

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Bearing The bearing to each target is also
displayed. The bearing may be shown as
magnetic to facilitate quick visual
identification using a compass or
binoculars. However, if you wish you can
change a setting to display bearings in
degrees true or relative to your vessel's
current heading.
Closest point of
approach (CPA) The CPA is the closest a target will come
to your vessel if both your vessel and the
target maintain their existing course and
speed. It is displayed in nautical miles to
the nearest tenth or hundredth. As either
your vessel or the target changes its course
or speed, the CPA (along with all other
computed data) is automatically
recomputed and redisplayed.
Time until CPA
(TCPA) This is the amount of time until the CPA
will occur. It indicates how much time is
available before the two vessels will reach
their nearest distance to each other. It is
displayed in minutes and seconds or just
minutes if the time exceeds one hour.
The
AIS
WatchMate
automatically updates these computed values
whenever new information is received from a target and also
whenever your vessel's position, speed, or course changes. The
information displayed is always the most up-to-date available but
because the AIS and GPS systems do not guarantee the frequency of
updates from each vessel it can be inaccurate and can become further
inaccurate as time progresses without continuous updates from both
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