Simrad CR34, User Manual

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Chapter 3-14 CR34/44/54 Radar menu
return to AUTO mode by pressing [CLR].
Press [CLR] to toggle between HBR (Harbor) and AUTO mode.
Sea control – is used on the shorter ranges to suppress the effects
of sea clutter close to own ship by reducing the nearby gain level.
It can effectively reduce the strength of the mass of random echoes
received from nearby sea clutter for up to approx. 1 to 2 nm depend-
ing on wave and sea conditions. Sea control is set to reduce the
strength of these echoes such that the clutter appears only as inter-
mittent small dots, yet stable targets can still be distinguished.
If manual adjustments are made, the setting will affect the system’s
ability to detect targets and remove sea clutter in heavy sea situations.
Rain
– the rain clutter filter enhances the leading edge of a target
whereas the signal behind the leading edge area of rain will be
depressed. This can also be of great advantage on shorter ranges
to distinguish between two very close echoes on the same bearing
which may otherwise merge and appear as one echo.
To properly adjust for rain clutter:
1. Set rain clutter to zero.
2. Slowly increase rain clutter until the hazy area caused by the rain
or snow become less dense. Increasing it too much will not only
remove the rain clutter, but also other weak targets.
Note! Since Rain and Snow are continually changing in size and
density, tweaking of the rain clutter adjustment is necessary to
maintain the best results. Manual fine tuning of Gain and Sea may
improve the performance.
EBL
(Electronic Bearing Line) - bearing and distance (read-only)
from ship’s position to cursor. Two independent EBLs are available
- see section 3.2.6.
VRM
(Variable Range Marker) - bearing and distance (read-only)
from ship’s position to VRM cursor. Two independent VRMs are
available - see section 3.2.6.
Cur
sor - bearing and distance (read-only) from ship’s position to
cursor.
Trails after targets – toggle between OFF, 30sec, 1min, 2min,
5min, 10min, 15min, 30min, PERM (permanent).
Using the Trails feature will show the trails of target movement as an