Raymarine e7 User Reference page 110

Range rings
Range rings give you an incremental representation of distance
from your vessel to help you judge distances at a glance. The rings
are always centred on your vessel, and the scale varies to suit your
current zoom setting. Each ring is labelled with the distance from
your vessel.
Enabling range rings
In the 2D chart view:
1. Select Menu.
2. Select Presentation.
3. Select Layers.
4. Select Range Rings so that On is highlighted.
Selecting range rings will switch range rings between On and Off.
3D Display Options
The following options are available with the chart application in 3D
view:
• Centre Of View — Switches a cross hair on and off at the centre
of the screen at sea level.
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• Exaggeration — Adjusting the exaggeration has the effect of
vertically stretching objects on the chart, making it easier to see
their shape and position.
• Transducer Cone — Switches on and off a transducer cone
indicating the coverage of a fishfinder transducer.
• Depth Scale — Switches on and off a depth scale at your vessel
position.
Enabling centre of view
To enable the centre of view cross hair at sea level follow the steps
below:
In 3D view:
1. Select Menu.
2. Select Presentation.
3. Select Layers.
4. Select 3D Display Options.
5. Select Centre of View so that On is highlighted.
Selecting centre of view will switch the cross hair on and off.
Adjusting the 3D chart exaggeration
In the 3D chart view:
1. Select Menu.
2. Select Presentation.
3. Select Layers.
4. Select 3D Display Options.
5. Select Exaggeration.
6. Use the Rotary Control to adjust the exaggeration to the
required setting between 1.0 and 20.0.
Enabling transducer cone
To enable the transducer cone to indicate the coverage of your
fishfinder transducer follow the steps below:
In 3D view:
1. Select Menu.
e7 / e7D — User reference