Raymarine DSM250, Руководство пользователя

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6-10 DSM250 Digital Sounder Module
➤
To set an alarm:
1. Press the
ALARMS
key. The alarms soft keys are displayed.
2. For the shallow or deep alarms, press the
SHALLOW ALARM
or
DEEP ALARM
soft key then use the up or down soft keys to change
the alarm limit.
Press the up arrow (right) soft key to select deeper water; press the
down arrow (left) soft key to select shallower water.
3. If desired, press the
ALARM OFF ON
soft key to toggle the alarm on
or off. If you turn the shallow or deep alarm off, its value is
retained and will be used when you turn the alarm on again.
4. Press
ENTER
or
CLEAR
to save the changes and clear the list.
➤
To silence an alarm and clear the alarm message, press any key.
6.3 Using VRM to Determine Depth & Distance from Vessel
The
VRM
(variable range marker) key is used in Sonar mode to
determine the depth and distance-behind-boat of an object on the
display. The
VRM
function is available on the scrolling sonar dis-
play, bottom lock, and zoom windows.
A VRM is displayed as a cross hair with height and width of the
display window. The center of the crosshair is the reference for
which depth and distance-behind-boat are displayed. You can use
the context-sensitive cursor to move the VRM over a particular
object.
Depth is displayed, in the system units, on the right hand edge of
horizontal line. In the scrolling sonar and zoom windows depth is
measured from the surface down. In the bottom lock window,
depth is measure from the bottom up.
Distance-behind-boat is displayed next to the vertical line, at the
top of the window. The VRM distance units correspond to the
depth units assigned in the system set up parameters you have
assigned for your display unit, as follows:
DEEP
ALARM
SHALLOW
ALARM
FISH
ALARM
OFF ON
D5031-1
ALARMS
VRM/EBL