Garmin nuvi 500-Series, Руководство пользователя

Страница: 22 / 44

Setting the Scroll Speed
You can set the rate at which the sonar image moves across
the screen. A higher scroll speed shows more detail, especially
while moving or trolling. A lower scroll speed displays sonar
information on the screen longer. Setting the scroll speed on
one sonar view applies to all the sonar views.
1
From a sonar view, select Menu > Sonar Setup > Scroll
Speed .
2
Select an option:
• To adjust the scroll speed automatically using speed-
over-ground or water speed data, select Auto .
The Auto setting selects a scroll rate to match the boat
speed, so targets in the water are drawn with the correct
aspect ratio and appear less distorted. When viewing
DownVü or SideVü sonar views, it is recommend to use
the Auto setting.
• To use a very fast scroll speed, select Ultrascroll® .
The Ultrascroll option quickly scrolls new sonar data, but
with a reduced image quality. For most situations, the
Fast option provides a good balance between a quickly
scrolling image and targets that are less distorted.
Sonar Frequencies
NOTE: The frequencies available depend on the chartplotter,
sounder modules, and transducer being used.
Adjusting the frequency helps adapt the sonar for your particular
goals and the present depth of the water.
Higher frequencies use narrow beam widths, and are better for
high-speed operation and rough sea conditions. Bottom
definition and thermocline definition can be better when using a
higher frequency.
Lower frequencies use wider beam widths, which can let the
fisherman see more targets, but could also generate more
surface noise and reduce bottom signal continuity during rough
sea conditions. Wider beam widths generate larger arches for
fish target returns, making them ideal for locating fish. Wider
beam widths also perform better in deep water, because the
lower frequency has better deep water penetration.
Chirp frequencies allow you to sweep each pulse through a
range of frequencies, resulting in better target separation in
deep water. Chirp can be used to distinctly identify targets, like
individual fish in a school, and for deep water applications.
Chirp generally performs better than single frequency
applications. Because some fish targets may show up better
using a fixed frequency, you should consider your goals and
water conditions when using Chirp.
Some sonar black boxes and transducers also provide the
ability to customize preset frequencies for each transducer
element, which enables you to change the frequency quickly
using the presets as the water and your goals change.
Viewing two frequencies concurrently using the split-frequency
view allows you to see deeper with the lower frequency return
and, at the same time, see more detail from the higher
frequency return.
Selecting Frequencies
NOTE: You cannot adjust the frequency for all sonar views and
transducers.
You can indicate which frequencies appear on the sonar
screen.
1
From a sonar view, select Menu > Frequency .
2
Select a frequency suited to your needs and water depth.
For more information on frequencies, see
Sonar
Frequencies .
Creating a Frequency Preset
NOTE: Not available with all transducers.
You can create a preset to save a specific sonar frequency,
which allows you to change frequencies quickly.
1
From a sonar view, select Menu > Frequency .
2
Select Add .
3
Enter a frequency.
Turning On the A-Scope
NOTE: This feature is not available in all sonar views.
The a-scope is a vertical flasher along the right side of the full-
screen sonar view. This feature expands the most recently
received sonar data so that it is easier to see. It can also be
helpful for detecting fish that are close to the bottom.
From a sonar view, select Menu > Sonar Setup >
Appearance > A-Scope .
Selecting the Transducer Type
Before you can select the transducer type, you must know what
kind of transducer you have.
If you are connecting a transducer that was not included with
the chartplotter, you may need to set the transducer type to
make the sonar function properly. If the device automatically
detected your transducer, this option does not appear.
1 From a sonar view, select Menu > Sonar Setup >
Installation > Transducer Type .
2
Select an option:
• If you have a 200/77 kHz, dual-beam transducer, select
Dual Beam .
• If you have a 200/50 kHz, dual-frequency transducer,
select Dual Frequency .
• If you have another type of transducer, select it from the
list.
Sonar Setup
NOTE: Not all options and settings apply to all models, sounder
modules, and transducers.
Sonar Settings
NOTE: Not all options and settings apply to all models, sounder
modules, and transducers.
From a sonar view, select
Menu > Sonar Setup .
Depth Line : Shows a quick-reference depth line.
Scroll Speed : Sets the rate at which the sonar scrolls from right
to left.
In shallow water you might want to slow the scroll speed to
extend the length of time the information is displayed on
screen. In deeper water you might want to increase the scroll
speed.
On-screen Control : Sets what the buttons on the sonar screen
control. This is available for touchscreen devices.
Range Lines : Shows the vertical lines indicating the distance to
the right and left of the boat. Available for SideVü sonar view.
Color Scheme : Sets the color scheme of the sonar view. This
setting might be available in the Appearance menu.
The high contrast color schemes provide darker color
assignments to the low intensity returns. The low contrast
color schemes provide color assignments to the low intensity
returns that are similar to the background color.
Appearance : See Sonar Appearance Settings .
Overlay Numbers : Sets the data shown on the sonar screen.
Advanced : See Advanced Sonar Settings .
16 Sonar