Eagle ULTRANAVGPS Specifications download pdf (Page 54)

PRIMARY and ALTERNATE SOLUTIONS

The loran

normally

determines its

position by

measuring

the time

difference between the master and two other

secondary

stations.

Each time difference results in a line of

position.

Your

present posi-

tion is the intersection of the lines of

position.

This is called

a "fix'.

A mathematical formula in the loran receiver uses TD's to determine

the

latitude/longitude position.

Due to the nature

of

loran, your

position

in

latitude/longitude

can be on either side of a

baseline.

(The

baseline is an

imaginary straight

line

connecting

the master and

each

secondary station.)

It's

possible

for

the

loran to lock onto the

stations,

give good

fix

qualities

and

signal strengths,

but

show the latitude/lon-

gitude

on

the

other side of the

baseline

from

your.present

position.

These two

positions (your present position

and the one on the other

side of the

baseline)

are called the

primary

and alternate solutions.

They're usually

far

apart, making

it

easy

to tell if the loran is

displaying

a

position

far from

your

actual location.

However,

if

you're

close to

the

baseline,

the difference between the alternate and

primary

solution

could be

only

a few

miles,

or less. For this reason

alone,

its

always

important

to

know

your approximate position

when

initializing

or

using

a loran.

To switch

from the

primary

to

the alternate

solution,

first

press

the

MENU

key.

Next,

press

the

key adjacent

to the

"CHANGE SETUP"

label. Now

press

the

key adjacent

to the "MORE" label.

To Go

(DTG)

is

displayed immediately

below the C.D.I.

This is the distance from

your present position

to the

When the UltraNav is first turned

on,

the distance is shown

The

bearing

to the

waypoint

from

your present position displays

at the

center left side of the screen. The

bearing

is shown

in

degrees

magnetic

(MBRG)

when the UltraNav is turned on for the

first

time.

To switch to

a

true

bearing display,

see the "SELECT TRUE BEAR-

INGS" section.

The

waypoint you're currently using

for

navigation

shows to the

right

of the

bearing display.

The cross track error

(XTE) displays

at the bottom of the

screen,

right

above the water

depth display.

This is the same distance as shown at

the

top

of the screen

by

the C.D.I.

display, only

in

digital

numbers.

When

the UltraNav is first turned

on,

the cross track error

displays

in

nautical miles.

NAVIGATION

SUMMARY SCREEN

This screen shows all

navigation

information

to a

waypoint

in

digital

numbers. To

display

this

screen,

press

the MENU

key

twice while the

UltraNav is in the Loran mode. The

screen shown below

appears.

Nowpress

the

key adjacent

to the "NAy SUMMARY SCREEN". The

following

screen

appears.

(Note:

All

features are in nautical

miles,

degrees magnetic,

and knots

when the UltraNav is turned on for

the

very

first

time.)

Distance To Go

(DTG)

shows at the

top

of the screen. This is the dis-

tance

to the last recalled

waypoint.

Cross Track Error

(XTE)

is the

second item on this screen.

Cross

track error is the distance to the side

of

your

desired course.

50

55

Distance

indicator.

waypoint.

in nautical miles.

OTO (NIl) 5.07

XTE(NM)L 1101

BRO(IIflG) 327°

HOG (MflG) 3220

0110 (1(N) 16.4

SOG (1(N) 16.6

TTG

00:18:32

OEPTH(FT) 87a9

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