
-•- S_S!_ left. Thesatellitenumber(SAT)inusebythechannelshowstotherightof
flMflUC-uwmauc
Whenturned onforthefirst
time,
theUItraNavGPS automatically places
the bottomsignal inthelowerhalfofthe screen. This is called Auto
Rangingand is partofthe automatic function. The rangecannot be
changedmanuallywhiletheunitisinautomatic.
RANGE
- Manual
TheUltraNavGPSgivesyou
controloverthe
rangewhen
it'sin
the
manual
mode. Boththelowerand theupper
limitareadjustable.
To
changetherange,firstmakecertaintheUItraNavGPSisinthemanual
mode. Ifnecessary, presstheAUTO
keytoswitchtothemanual mode.
Next,
press
theRANGEkey. Twoarrowsappear
in
the
lowerleftcorner
of thedisplay. These are the range adjustarrows. Pressthe key
corresponding tothe upper orlowerarrow todecrease orincrease the
range.Theavailable rangesare0-1
0,20,40,60,100,150,200,300,500,
900feet. Afterthedesired range
isdisplayed, press
theCLEAR keyto
erasethe
rangearrows.
MANUAL
RANGE
ADJUSTMENT
MENU
NOTE:Thedepth capability oftheUltraNavGPSdepends
onthetrans-
ducerinstallation, waterand bottom conditions, andotherfactors. You
canexpect
to read depths in excessof350feet inbothfreshand salt
water.
thechannel number. Azimuth isthe direction ofthesatellitefromyour
present
location. Elevation isthe
heightofthesatellite abovethehorizon.
SIGisthesignal-to-noise ratio. Thehigher
the
SNR,
thebetter. Channel
statushasthreepossible modes:Idle
(-),Searching(S),
orTracking(1). If
thechannel isnot
using
a
satellite,
thenitisidleanddashedlines
appearin
the displays
forthat channel. Ifit is searching forthesatellite, the (S)
appears. Onceit'slocked ontothesatellite, thenthe(T) appears. The
example
screen onthe
previous page
haschannels 1,2, and
4
tracking, 3
is
searching,
and 5isidle.
BeneaththeSatelliteInfo
display
isthelistofsatellites thatarevisablefrom
yourlocation. They
arelistedbytheirsatellitenumber.
Toexitfromthesatellite info
screen, presstheCLEAR
key.
ENGINEERING SCREEN
TheUltraNavGPS letsyouviewtheDilutionofPrecisionforthe
horizontal
(HDOP), geometric(GDOP),vertical
(VDOP), position (PDOP), and time
(TDOP). ThesearedisplayedontheEngineering Screen.
Toviewthisscreen, press
theMENU key
threetimes. Nowpress
the
key
adjacent tothe"ENG SCREEN"label. Thescreen shown belowappears.
GDOPstandsfor Geometric DilutionOf Pre-
cision. Thisisacrossingangle indicator. It
shows thecombination value of horizontal
(HDOP), vertical
(VDOP), andTime
(TDOP).
ThesmallertheGDOP number is, thebetter
thecrossingangles
are. TheGPS receiver
selectssatellites based
on
GDOP,thereforeit
always
triestousesatellitesthatwillresult in
good crossing angles. Thebestwaytouse
GDOPistoanticipatesystem problems. In
otherwords, ifthecrossing angles are de-
creasing, thenthesatellites couldbemoving
out of your viewingrange. Therefore, the ______________________
systemmaybecomeunusable ifmoresatel-
litesdon't appear shortly.
Abovethe GOOP display is the HDOP display. This shows the 2D,
horizontalcrossingangle. Again,
thesmallerthenumber
is,thebetter
the
crossingangles
are.Typically, 1-4is
good, 5-10isfair,andanything over
10ispoor
forall
displays
onthispage. TheUTCOFFSET isthedifference
between yourlocal timeandUTC (GMT).
12 61
MiTh1 t
j33FT 0
r
flDJUST
R'HOEi
HOOP 2.37
GOOP 3.83
'JooP 2.41
PooP 3.38
TOOP 1.79
UTC OFFSET
05:00
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