Raymarine L470 Bedienungsanleitung

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Fishfinders
The Furuno LS6100 and Garmin 240 Blue finish one-two in our look at six
units from $300 to $400. We tested at three water depths and evaluated
screen visibility at day and at night.
odern scanning sonar
equipment has lots of
names and just as many
M
uses. The names: fishfinders, bot-
tom machines, echo sounders,
depthsounders or just plain sound-
ers. They all do the same thing—
use sound waves to look through the
water and paint us a picture on a
display screen of what’s below. The
uses: navigate the depths—or the
shallows—to avoid hitting rocks or
the bottom, determine bottom com-
position and contours for anchoring,
locate where the fish should be (that
secret spot), or simply to find fish.
Sonar selection and usage can
get confusing, with lots of options.
But no matter what you need a so-
nar machine for, you’ll need to know
the answers to some of the basic
questions. Which transducer fre-
quency should I use? How much
resolution do I need? How much
power do I need? Where should I
set the Gain? What the heck is that
upside-down crescent shape on the
screen? These are just some of the
questions posed by both novice and
experienced boat owners. And fi-
nally, which unit offers the best bang
for the buck?
Let’s start with a quick overview
of how sonar equipment works. First,
it sends a pulse of sound down, via
the transducer, which bounces off
objects in the water, like rocks,
wrecks and fish. Second, it measures
the time that sound pulse takes to
return. Finally, it uses that informa-
tion to show us a screen display.
Sound waves reflect best off objects
with densities different than the
water’s. So rocks, mud, metal and
the air-filled swim bladders of fish
all show up well. Every-
thing on the screen is his-
tory, stuff you have al-
ready passed.
We also need to talk
about how variables such
as power output, trans-
ducer selection, screen
type, screen resolution,
and certain functions can
affect a finder’s perfor-
mance.
Let’s start with screen
type. All the units we
tested have monochrome
LCD screens. In the un-
der-$400 range, these
screens dominate the
marketplace. The LCD
screens are lighter, re-
quire less power and are
easier to waterproof than
a comparable CRT
screen. The latest im-
provements in LCD tech-
nology, such as glare-re-
ducing coatings and inter-
nal backlighting, make
these screens easy to see
even in direct sunlight.
The older-technology CRT
screens are made of glass,
require more power, may
need a hood to make the
screen readable in direct
sunlight, and are bigger and heavier
than a comparable-sized LCD.
Screen resolution is normally
expressed in a horizontal and verti-
cal pixel count, such as 234 x 320.
This means 234 dots make up each
horizontal line of the screen, and
320 dots comprise every vertical
line. The horizontal pixel count tells
you how much history your screen
will show and how much screen
space you will have for split-screen
functions. We’ll talk about some of
them later.
The higher the vertical pixel
count, the better the machine will
be able to show a distinction be-
tween the sea bed and fish, espe-
cially in deep water. Here’s why:
Let’s say you’re scanning in 20' of
water on a unit with 320 pixels of
vertical resolution. Each pixel rep-
Above: A 25’ Contender center console served
as our testing platform. Transducers were all
set to a frequency of 200 kHz. Note that we
examined each machine’s picture in a side-by-
side comparison as the boat moved over the
targets below.
Reprinted from October 2002...
TM
october.final.p65 10/23/02, 1:20 PM2
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Inhaltsverzeichnis

Seite 1 - Fishfinders

FishfindersThe Furuno LS6100 and Garmin 240 Blue finish one-two in our look at sixunits from $300 to $400. We tested at three water depths and evaluat

Seite 2

resents less than an inch of waterdepth, which means the machineshould easily show even a small fishjust a few inches off the bottom. Trythe same thin

Seite 3 - Value Guide: Fishfinders

at least 120'. Now increase your gainuntil you begin to get a second bot-tom echo at 100'. Now reselect adepth range closer to 50 feet andyo

Seite 4 - Performance: Fishfinders

Performance: FishfindersShallow-waterPerformanceGoodGoodGoodGoodFairGoodDeep-waterPerformanceGoodGoodPoorFairPoorFairEaseof UseGoodGoodGoodGoodFairGoo

Seite 5 - Raymarine L470

opinion, wouldn’t expect this unitto read much deeper. The screen onthe Legend 2000 is just not as brightand easy to see as some of the otherunits. Pl

Seite 6 - Conclusions

has one of the larger screens. Toobad the resolution at 240 x 128 iswell below the best units. The L470came equipped with an Airmar P65transducer, whi

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