Function Key [F9] - Furuno GP-280 Operator's Manual

11.11 Function Key [F9]

The [F9] key provides for a macro function to instantly select a combination of assigned functions
or settings. This key provides optimum radar settings for a specific purpose with a single key
operation. For example, suppose that you have been navigating along a coast for hours and now
you are approaching a harbor, your final destination.
You will have to adjust your radar to change from the settings for coastal navigation to those for
harbor approach. Every time your navigating environment or task changes, you must adjust the
radar, which can be a nuisance in a busy situation. Instead of changing radar settings case by
case, it is possible to assign the function key [F9] to provide optimum settings for often
encountered situations.
The function key [F9] key can be assigned a combination of three sets of particular radar settings
that will be most suited to your specific navigating purpose, such as buoy, harbor or coast.
Each function defines a combination of several radar settings for achieving optimum setup for a
particular navigating situation. Those involved are interference rejector, echo stretch, echo
average, automatic anti-clutter, pulselength, video contrast and noise rejector settings.
Note 1: Function key presetting requires a good knowledge of optimum radar settings. If you
want to change the original function key settings, consult your nearest FURUNO representative
or dealer.
Note 2: The function key feature uses the echo averaging function thus a gyrocompass or log
signal is required to use the function key.
Function
COAST Optimum setting for short range detection using a range scale between 1.5 and 6 nm
on calm seas.
OCEAN Optimum setting for long range detection using a range scale between 6 and 24 nm.
R-SEA Optimum setting for heavy seas using a range scale between 3 and 12 nm.
RAIN Optimum setting for heavy rain using a range scale between 6 and 24 nm
BIRD-NEAR Optimum setting for detecting birds using a range scale between 3 and 8 nm.
BIRD-FAR Optimum setting for detecting birds using a range scale between 16 and 24 nm.
FLOAT Optimum setting for discriminating buoys from sea clutter using a range scale
between 6 and 24 nm.
BUOY Optimum setting for detecting buoys and other small targets using a range scale
between 6 and 24 nm.
PORT Optimum setting for short range navigation in a harbor using a range scale of 1.5 nm
or less.
FAR Optimum setting for long range detection using a range scale of 6 nm or larger.
11-24
Functions
Description