Raymarine E70085 Dragonfly, Operation Manual

Page: 36 / 96

Note: The Demo movie option is for retail demonstration
purposes only.
Depth Offset
Depths are measured from the transducer to the sea bed, but
you can apply an offset value to the depth data, so that the
displayed depth reading represents the depth to the sea bed
from either the keel or the waterline.
Before attempting to set a waterline or keel offset, find out
the vertical separation between the transducer and either
the waterline or the bottom of the keel on your vessel, as
appropriate. Then set the appropriate depth offset value.
D9343--2
1 2 3
1 Waterline offset
2 Transducer / Zero offset
3
Keel offset
If an offset is not applied, displayed depth readings represent the
distance from the transducer to the sea bed.
Setting the depth offset
From the Tools & Setting page:
1. Select System Settings .
2. Select Sonar Set-up .
3. Select Depth Offset .
The depth offset numeric adjust control is displayed.
4. Adjust the offset to the required value.
5. Select Ok to confirm the new value and close the numeric
adjust control.
6.4 GPS Check
Checking GPS operation
You can check that the GPS is functioning correctly using the
Chart application.
1. Select a view from the View switcher which includes the
Chart application.
2. Check the screen.
You should see:
Your vessel position (indicates a GPS fix) . Your current
position is represented by a vessel symbol or solid circle.
Your position is also displayed in the data cell on the bottom
right of the display.
A solid circle on the chart indicates that the vessel speed
is to low (i.e. less than 0.15 kts) to provide Course Over
Ground (COG) data.
Note: It is recommended that you check the displayed vessel
position in the Chart application against your actual proximity
to a known charted object. GPS receivers typically have an
accuracy of between 5 m and 15 m.
Note: A GPS Status screen is available from the Tools &
Settings page. This provides satellite signal strength and
other relevant information.
GPS setup
The GPS setup options enable you to configure a GPS receiver.
The Global Positioning System (GPS) is used to position your
vessel on the chart. You can set up your GPS receiver and
check its status from the GPS Status option in the
System
Settings menu. For each tracked satellite, the screen provides
the following information:
• Satellite number.
• Signal strength bar.
• Status.
• Azimuth angle.
• Elevation angle.
• A sky-view to show the position of tracked satellites.
36
Dragonfly