4
ST60+ Depth Instrument Owner’s Handbook
When the instrument is operating as a master, you can check the alarm levels and
if necessary set them up (see
Depth alarms flow chart). To do this, use the alarm
button to select the required alarm level, then:
• To enable or disable the alarm, hold in the
reset
button for 1 second. If an
alarm is disabled, the associated screen shows an
OFF
legend.
• To change the value of the alarm level, press the
offset
and
reset
buttons
together to enter adjust mode, then use these buttons individually to set the
required value.
Depth offsets
Depths are measured from the transducer to the sea bed. However, offsets to the
actual distances measured can be applied during calibration (see
Chapter 4,
Calibration ), so that the displayed depth reading represents either the depth
from the keel or the depth from the waterline (W/L).
To see the offsets applied on your vessel, press the
offset
button. If the
instrument is operating as a master, the display will show the size of the offset
(either positive or negative) and the appropriate legend:
• When the offset is a positive value, the legend
W/L
is displayed.
• When the offset is a negative value, the legend
KEEL
is displayed.
• When the offset is zero, the legend
OFFSET
is displayed. With zero offset
applied, the displayed depth reading is measured from the transducer.
1.3 Display settings
Illumination
When the instrument is first powered up, the display illumination is set to its
lowest (courtesy) level, to facilitate initial access to the buttons. To adjust the level
of illumination:
1. Hold down the
depth
button for approximately one second, to enter the illu-
mination-adjust mode.
2. There are four preset illumination levels. Momentarily press the
depth
but-
ton to cycle through these levels until you reach the level you want.
WARNING: Use the correct depth offset
The use of the correct depth offset is critical to the safety of the
vessel. If incorrect offset values are applied, this could result in
misleading depth information being displayed with a
consequent risk of running aground. Take great care to ensure
you set the correct value, as described in
Chapter 4, Calibration.
81262_2.book Page 4 Friday, November 11, 2005 11:11 AM
