Raymarine DSM250 Owner's Handbook Manual page 103

Chapter 6: Sonar Mode Operation
➤
MARKS
MOB
data box
➤
MARKS
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.
FREQUENCY
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.
POSITION
N 43°04^76
W070°44^83
ZOOM BTM.LOCK
MOB
60
80
100
A-SCOPE
D6188-1
6-15
MOB
position