Chapter 6: Sonar Mode Operation 6-15
Note: To obtain MOB position, you need either of the following:
• Position data from a GPS or equivalent device
• Heading and speed data, so that the position can be calculated by
dead reckoning
➤ To initiate the MOB procedure, press and hold the MARKS key for
two seconds. The system then performs the following tasks
automatically:
• Marks the Sonar image with a vertical line and the letters MOB.
• Marks the current position on the chart display with a MOB sym-
bol
.
• Displays the MOB data box, showing the bearing and distance
from your vessel to the MOB waypoint position and the elapsed
time since the MOB was initiated (Figure 6-3 ).
• Sounds a 4-second alarm pattern every 30 seconds.
• Sends an MOB message (including bearing and distance) to other
units in the system, via the SeaTalk connection.
Figure 6-3: MOB Display
➤ To cancel the MOB, press and hold the MARKS key for 2 seconds.
The MOB symbol and data box are removed.
Note: The MOB procedure can also be initiated or cancelled if the
appropriate SeaTalk message is received by the display unit.
MARKS
D6188-1
MOB
position
MOB
data box
ZOOMFREQUENCY
BTM.LOCK A-SCOPE
MOB
100
RNG
0.33
nm
BRG
162°
T
00:05:24
MOB
POSITION
N 43°04^76
W070°44^83
80
60
MARKS
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