Raymarine GPM400, Справочное руководство

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105
Chapter 8: The Fishfinder
Viewing frequencies within a preset
If the preset you are using has two frequencies, you can view either
one or both of those frequencies in separate windows.
To set frequency views
1. Press the PRESENTATION softkey.
2. Toggle to F1 , F2 or BOTH on the VIEW softkey.
3. Press OK .
Placing waypoints
You can pause the scrolling image to place a waypoint at a position
or target that you want to return to at a later date. When a waypoint
is placed, its details are added to the Waypoint List and a vertical
line labelled WPT is placed on screen. You can edit waypoints and
navigate to them in an active fishfinder window.
8.10 Fishfinder alarms
In addition to the system alarms (see page 194 ), the following
alarms can be set when you are connected to a DSM or when the
simulator is on:
• Fish Alarms - sound when a target meets the specified sensi-
tivity level and, is within the depth limits (if enabled). The
greater the fish alarm sensitivity, the greater the number of tar-
get image depths displayed.
• Shallow/Deep Alarms - sound when the DSM detects that the
depth is less than the shallow limit, or greater than the deep
limit.
You can switch the alarms on, set the limits and specify the fish
alarm sensitivity.
8.11 Editing presets
You can select frequencies for each preset from the Setup Fre-
quency Preset screen. All available frequencies are detected by the
system and made available on this menu. You can:
• Specify one or two frequencies for each of the four presets.
• Edit preset names (EDIT NAME softkey).
• Reset all presets to factory defaults (RESET ALL softkey).
• Reset a selected preset to factory defaults (RESET <PRESET>
softkey).
The fishfinder can can handle only one set of frequency presets
across Nav Stations. It is not possible to set one Nav Station up
with a different set of fishfinder frequencies to another.
To open the Setup Frequency Preset screen
1. With a fishfinder window active, press the MENU button .
2. Select Configure Frequency Presets .
Manual frequency selection
If you select a frequency manually, the fishfinder operates at that
fixed frequency.
To set frequencies manually
1. Open the Configure Frequency Presets screen.
2. Select the frequency use wish to use from the list available.
Automatic frequency selection
The behaviour of automatic frequency selection varies according to
the configuration of your system and whether you are using a
DSM300 or DSM400. The table below summarises this behaviour.