Specifications

ManualsBrandsEagle ManualsFish Finding SonarULTRANAVGPS

NMEA

INTERFACE

The UltraNav can

send data out

according

to NMEA 0180010183

formats.

The NMEA

output

is turned

off

when the UltraNav is turned on for

the

very

first time. _____________________

To select the

NMEA

output, press

the

____________________

key

while a loran screen is

displayed.

Now

press

the

key adja

_____________________

cent to the 'CHANGE

SETUP" label.

Next,

press

the

key

two times.

Finally, press

the

key adjacent

to the

SELECT

NMEA OUTPUT" label. _______

The screen shown

below

appears.

Simply

press

key adjacent

to the desired

output.

The NavGuide will

return to the last

loran screen and

output

data

on the white serial data

wire.

(See

the

Power Connections section for

wiring instructiops.)

ASF Correction

Loran

signals

are affected

the

terrain

they

travel over. Plains,

lakes, mountains,

and cities affect

the

signal

and

they

each affect

it in

different

ways.

This effect is called

the additional

secondary phase

factor,

or ASF.

It's

usually

factored in when a loran chart

is made.

However,

ASF's

vary

from

place

place,

so there can be differences

between the chart and the real

world.

There can also b a difference

your

actual

position

and the

one

displayed by

the

loran,

due to

ASF. In this

case,

the loran

signals

are

distorted from their theoretical

position.

Since the measured

TD's are

shifted,

the loran shows a TD or

latitude/longitude

that is not the

actual

position.

The UltraNav has an correction feature that lets

you change

the ASF.

This forces the loran to use a new ASF instead

of the one that

resides

in its

memory.

You can shift the ASF

changing

the TD offset

entering your

actual

latitude/longitude position.

4. The

boat must be

moving

at aslow

trolling speed

to seefish arches. If the

boat

motionless,

fish

stay

in the

cone, showing

onthe

display

straight

horizontal

lines.

ELECTRICAL NOISE

major

cause

of sonar

problems

is electrical noise. This

usually appears

on the

sonar's

display

as random

patterns

of dots or lines. In severe cases,

it can

completely

cover the screen with

black

dots,

or cause the unit

operate

erraticly,

or not

at all.

To eliminate or minimize

the effects

of electrical

noise,

first

try

to determine the

cause.

With the boat at rest in the

water,

the first

thing you

should

do is turn all

electrical

equipment

on the boat off.

Make certain the

engine

is off,

also. If

your

unit does NOT

have ASP

(Advanced

Signal Processing),

you

can turn ASP

off,

turn on

your

sonar unit. There

should be a

steady

bottom

signal

on the

display.

Now turn

on each

piece

of electrical

equipment

on the boat

and viewthe

effect on the

sonar's

display. Forexample,

turn on the

bilge pump

and

view the

sonardisplayfor

noise. if no noise

present,

turn the

pump

off,

then turn on the

VHF radio

and transmit.

Keep

doing

this until all electrical

equipment

has been

turned

on,

theireffect onthe

sonardisplay

noted,

then turned

off. If

your

unit has

ASP,

and

you

can't turn it

off,

first turn on each

piece

of electrical

equipment

board,

one at a

time,

then turn on

the sonar unit You will have to

look

quickly

for

noise,

since

the ASP feature

starts

eliminating

noise fromthe

display

a few

seconds after the unit is turned

on.

you

find

noise interference from

an electrical

Instrument, trolling

motor,

pump,

radio,

try

to isolate the

problem.

You

can

usually

re-route the

sonar unit's

power

cable and

transducer cable

away

from the

wiring

that is

causing

the

interference.

VHF radio antenna cables radiate

noise when

transmitting,

so be

certain to

keep

the sonar's wires

away

from It. You

may

need to

route the sonar

unit's

powercable

directlytothe

batteryto

isolate

itfrom

otherwiring

on the boat.

It no noise

displays

on the sonar unit

from electrical

equipment,

then

make

certain

everything except

the sonar unit is turned

oft

then start the

engine.

Increase the RPM

with the

gearshift

in neutral.

If noise

appears

on the

display,

the

problem

could

be one of three

things;

spark

plugs,

alternator,

ortachometer

wiring. Try using

resistorsparkplugs,

alternatorf liters,

routing

the sonar

unit's

power

cable

away

from

engine wiring. Again,

routing

the

powercable

directlyto

the

battery helps

eliminate

noise

problems.

Make

certain to use the in-line fuse

supplied

with the unit when

wiring

the

power

cable to the

battery.

When no noise

appears

on the sonar unit

after all of the above

tests,

then

the

noise source is

probably

cavitation.

Many

novices

persons

with limited

experience

make

hasty

sonar installations which function

perfectly

in shallow

water,

orwhen the boat is at rest. In

nearly

all

cases,

the cause

of the malfunction

will be the location and/or

angle

of the

transducer. The face of the transducer

must be

placed

a location that has a smooth

flow of water at all

boat

speeds.

Read

your

transducer owners manual for the

best

mounting position.

OUTPUT

OFF

Select

CIJT

HMEn 0183

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