Raymarine e7 User Reference page 130

Menu item
Fish
Guard Zone
Off Track
130
Description
If the Fish alarm and fish depth limits alarm are set to On, a
warning sounds is triggered if any target meets the sensitivity
level and is within the Shallow Fish Limit and Deep Fish Limit that
you specify. The following items are available in the sub-menu:
• Fish — Switches fish alarm On and Off.
• Fish Sensitivity — If the Fish alarm is set to On, an alarm is
triggered when the fish return strength reaches the sensitivity
that you specify.
• Fish Depth Limits — Switches depth limits On and Off.
• Shallow Fish Limit — Specifies the lower value for the Fish
Alarm Depth Limit.
• Deep Fish Limit — Specifies the upper value for the Fish
Alarm Depth Limit.
The Guard Zone feature in the radar application triggers an alarm
when a target is within a specified zone. You can adjust the
sensitivity of the alarm. Ensure that the sensitivity is not set too
low, or targets may be missed and the alarm will not be triggered.
When set to On, during active navigation an alarm is triggered
when your vessel steers off-track more than the value you
specify for the Off Track XTE setting.
Options
Fish
• Off (default)
• On
Fish Sensitivity
• 1 to 10
Fish Depth Limits
• On
• Off (default)
Shallow Fish Limit
• 2 ft (or equivalent units) to the maximum of the
transducer range
Deep Fish Limit
• 2 ft (or equivalent units) to the maximum of the
transducer range
Guard Zone Sensitivity
• 1% to 100%
Off Track Alarm
• Off (default)
• On
Off Track XTE
• 0.01 to 9.99 nm (or equivalent units)
e7 / e7D — User reference