Furuno GP-1871F, Руководство оператора

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7. RADAR
7-4
7.9.3 How to change the bearing reference
Bearing can reference to either North (True) or relative to your heading (Relative).
Heading data input is required to show or change the bearing reference.
1. From the [Home] screen, tap [Settings] => [Radar] => [General]. The menu op-
tions appear in the right-hand side of the screen.
2. Tap the reference indication at [EBL Reference], then tap the desired reference.
3. Tap the [x] at the top-right corner of the menu to close the menu.
7.10 How to Shift the Screen
You can “off-set” the screen, moving the center (own ship position) to view areas not
already shown on the screen. This allows you to keep the same detection range, how-
ever it is limited to 75% of the screen, in any direction.
To shift the screen, drag the radar display in the direction you want to view. To return
the display to normal, tap the [Center] icon at the top-right of the screen.
7.11 How to Use Echo Stretch
The echo stretch feature enlarges targets in range to make them easier to see, and is
available on any range. To use the echo stretch feature, follow the procedure below.
1. Tap any location on the radar screen, other than echoes or indications. The pop
up menu appears.
2. Tap [Echo Stretch]. The echo stretch settings appear.
3. Set echo stretch referring to the options below.
• [Off]: Disable the echo stretch feature.
• [Low]: Targets are stretched by a small amount.
• [High]: Targets are stretched by a large amount.
Note: Echo stretch magnifies not only small targets, but also rain clutter and inter-
ference. For this reason, make sure interference and clutter are sufficiently re-
duced before using this feature.
7.12 How to Use the Sentry Zones
Sentry zones can be used to inform you when a target enters or leaves a preset area.
To set and adjust the sentry zones, follow the procedure below:
1. Swipe the bottom of the screen upwards to show the layered menu.
2. Tap the toggle button to select [ON] for [Sentry Zone 1] or [Sentry Zone 2], as re-
quired. Select [OFF] to hide the sentry zone. This procedure assumes that at least
one sentry zone is set to [ON].
3. Tap any location on the radar screen, other than echoes, indications or the lay-
ered menu. The layered menu disappears.
[Center] icon: