Eagle Electronics UltraNav II 0.0

the upper right corner. To set it, simply

enterthe desired depth using

the

numbered keys. Remember to add tenths. For example, to set the keel

offset to three

feet,

first press the

then

press the 0

keys. Next, press

the

key next to the ENTER label. Press the key next to the "EXIT" label to

return to the sonar screen.

To enter a negative keel offset, use the same steps

as above, but press

the down arrow

keyto

switch the

depth

from

positive

to

negative before

you

press the key next to the "ENTER" label.

turn the keel offset feature

off, enter 0.0.

CALIBRATE SPEED

The speed display on the sonar screens comes from the optional speed

sensor - not the GPS receiver. To

calibrate this sensor to

your boat, first

press

the MENU

key

sixtimes while asonarscreen is

showing. Now

press

the key next to the "CALIBRATE SPEED" label. The screen shown below

appears.

Your current boat speed is

shown in the

upper

left coner of

the screen. The calibration in

percent is shown in the upper

rightcorner. Now enterthe

per-

cent

change that is needed to

make the UltraNav li's speed

display match your actual

speed. For example, if the

UltraNav Ii's speed display is

five percent slower than your

actual speed, then use a posi-

tive five percent. If the

UltraNav's

speed display

isfive

use a

negative

five

percent speed calibration.

The

and down arrow keys

change the factor from positive to negative.

When you have the

speedometer calibrated, press the key next to the

"EXIT" label to return to the sonar screen.

PRESET SONAR AND OPS

The UltraNav II has a built-in memory that saves all settings

such as

sensitivity,

chart

speed, keel offset, speed calibration, and more. Virtually

all settings except

for waypoint and route information is saved in this

memory. (Waypoints, icons, and

routes are saved in a

separate memory.)

ACCURACY

You

may

have

heard tales of

extraordinary accuracy

from GPS

receivers.

The

DOD requires accuracy of 10

to 15 meters from the satellite system.

However, only

the

military gets

this

precision. The

way

the

military keeps

us and other unauthorized people

from

using

the more precise system

coding. In other

words, the data coming from The satellites is encrypted.

Civilian OPS receivers use "C/A Code." It's

accuracy

intentionallyworse

than the military's "P Code." in this manner, civilian users worldwide can

• benefit from excellent position fixes. Meanwhile, the military keeps the

• most accurate

system away from

potential enemies. Theoretically, C/A

code can give accurate position fixes up

to 15 meters. This is more

than

adequate for most

people.

However (as

of this

writing), the

military isn't satisfied with C/A's potential

accuracy in the hands of the world. So, it's degrading it further with

"Selective Availability" or SA. This is small, random errors intentionally

added to the

system

so your

accuracy

will

typically

be within 100 meters.

Of course, accuracy also depends on the

angle of the satellite above

the

horizon, signal-to-noise ratio,

the

number of satellites tracked at one time

(the

more the

better),

and other factors. The smallest ranges on the

plotter

may

not be usable if

the SA is high.

The

present position symbol

can move

off the screen even while

you're sifting still. MPH I•

0.0

Don't let this discourage you, however. GPS by nature has much faster

updates than other

systems (such as Loran), and typically

is much easier

to use. Accuracy, even with SA on is

still better than most other

navigation

systems. You've

purchased one of

the finest

navigation

instruments on the

market today. We hope you'll enjoy

it for many years to come.

The

EAGLE EGP-1 GPS Module

This GPS receiver is currently used in all Eagle OPS receivers, It's

small,

rugged, and fast. The

five channel design lets it track all satellites in view

and acquire up to five

satellites at onetime. It sends

position information

to the UltraNav II once

every second. By incorporating Rockwell's GPS

receiver

technology

with Eagle's state-of-the-art design and manufactur-

ing capabilities, Eagle brings to the consumer

the most advanced line of

OPS marine navigation systems available in the world.

USE NUMBERED KEYS TO

ENTER CALIBRflTION.

USE UP & DOWN CURSORS

FOR PLUS OR MINUS,.

percentfasterthan youractual

speed,

then

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