Icom MA-500TR Instruction Manual page 39

D CPA/TCPA
• Alarm
You can turn the collision alarm function ON or OFF.
q Push [∫] or [√] to select "Alarm."
w Push [ENT] to toggle this function ON or OFF.
• You can also turn ON the function by pushing [≈], or OFF by
pushing [Ω].
ON : "COLLISION ALARM" appears on the display, and
the alarm buzzer sounds* repeatedly when an AIS
target is closer than your CPA and TCPA settings, as
explained to page 32. (default)
* The alarm buzzer sounds only when the alarm buzzer
function is turned ON. (p. 35)
OFF : The collision alarm function is OFF.
e Push [CLEAR] to save and return to the Menu mode.
[∫], [√],
[Ω], [≈]
[ENT]
[CLEAR]
MENU MODE OPERATION
• Slow Warn
The GPS receiver calculated COG data of a vessel that is at
anchor or drifting is unreliable, and therefore the CPA and TCPA
data may not be calculated correctly. If a vessel is anchored in
your alarm zone, the unreliable data can cause the collision
alarm to sound many times, even if there is no real danger. To
prevent this, when the anchored vessel's SOG is less than this
set value, the Slow Warn function assumes that vessel's COG
is fixed towards your vessel and an alarm will sound.
q Push [∫] or [√] to select "Slow Warn."
w Push [Ω] or [≈] to input the value between 0.1 and 4.9 kt
(in 0.1 kt steps), or select OFF. (default: 1.0 kt)
e Push [CLEAR] to save and return to the Menu mode.
[∫], [√],
[Ω], [≈]
[CLEAR]
NOTE: If other vessels at anchor or drifting come into your
alarm zone, the Slow Warn alarm will sound again. Only if
the previous vessel disappears from the Dangerous List
(pp. 6, 17), and then re-enters the list, can a new Slow
Warn or regular alarm sound, depending on the vessels
SOG, or CPA and TCPA. The Slow Warn function operates
in the same way if your vessel is at anchor and other ves-
sels enter your alarm zone area.
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