Full Text Searchable PDF User Manual
Speed
ov r
ground
' t ..
, ,
..
,
_ .. t 1°
..
�
..
�
I
l
.. f ... f L LI
I
Track
«:: !L 0 lP lP & [fl
GPS
REPEATER
CONTENTS
INTRODUCTION
INSTALl:.JNG THE DISPL AY
INSTALLATION DIAGR AMS
2·3
GETTING OPER ATIONAL
USING THE REPEATER
UStNG THE ROADWAY DISPLAY
ROADWAY DISPLAYS
TECHNICAL INFORMA
T
ION
TROUBLE SHOOTING
Inside back cover/back cover
INTRODUCTION
The Clipper
GPS
Repeater is supplied with
10
metres of cable.
The unit will repeat the data sent by any GPS receiver set up to
send NMEA
0183
output at
4800
baud.
INSTALLING THE DISPLAY
Select a convenient position for the display on a panel or bulk
head. The site must be flat and the cavity
behind
the panel
must remain dry at all times. (The cable entry is deliberately
not sealed to ensure adequate ventilation. This prevents
misting of the display}.
Cut a hole in the panel 67mm high and 87mm wide. Bring the
wiring th rough the hole in the panel and pass the
10
metre
cable through the hole.
Unscrew and remove the two wing nuts from the rear of ·the
instrument and remove the stainless steel clamping bracket.
Fit the
"O"
ring seal into the groove in the panel mounting face
of the instrument. Ensure that it is correctly lying in its groove
before fitting the instrument to the panel, which provides the
watertight seal for the display.
F!t the instrument into the panel, fit the stainless clamp over
the studs, fit and tighten the two wing nuts finger tight only.
It is important that the 0-ring rubber seal makes good contact
with the panel to prevent water getting behind the unit and
entering the cavity behind the panel.
It is good practice to run the cables vertically downwards from
the unit, even if they later have to rise to connect to the
vessel's supplies. Doing so prevents any water that might get
onto the cables from running back along the cables and into
the unit.
1
GPS
- RECEIVER
NMEA OUTPUT or
If it exists. it's
usually labelled
NMEA OUTPUT
(-ve)
or NMEA OUTPUT
(REF).
If
not, then the reference is internally connected
to
ground, and can be ignored.
Figure
1
2
[L IPPEr
-GPS
+ve
12Volt SUPPLY
Figure
2
3
-ve
Uncoil the cable and install it on a convenient run
to
the GPS
receiver position.
Refer to Figures
1
and
2.
Connect the GPS
Receiver's
data
cable and power supply cables, into
the
Repeater's
3
way
terminal block. Connect
the
12
Volt ship's supply or a
12
Volt
battery
to
the
terminal
bl9ck as shown
in
figures
1
and
2.
GETTING OPERATIONAL
Switch
on
the GPS receiver. Refer to the manufacture r's
handbook,
a
nd
set up
the unit to
se
nd
NMEA
version
2.0
(or
later
v
ers
io
n) at
4800
Baud. When the GPS
R
e
p
e
ate
r is
powered
on,
the words Clipper GPS appear
momentarily on
the screen. Note that the words
are
shown in a mixture of
U
pp
e
r
case (capitals) and lower case
characters.
This is
because
the numerical display is also used to
display
text.
The International Seven-bar Substitution Character
Set
(ISBSCS,
u
s
u
a
l
l
y
shortened to ISCS) is u
s
e
d
to represent the
Upper-case
alpha-numeric characters used by
most GPS
receivers,
as shown
below.
ABCDEFGHIJKLMNOPQR
R•
r
•r r:•- u•
1
-
1
- nnoo.
OL oc runruCL "" '-''
,,-
STUVWXYZ 012345678
9-
5
tr
-
J-
-
U IJ U ..,
'-''L
4
On some GPS receivers,
no
NMEA output
is
se
n
t
until lock
onto
the
satellites is achieved. If
so, the
Repeater displays the
message "No G PS Signal" as a warning. When the
G
PS
Receiver has acquired lock, the current position (Latitude
and
Longitude)
will
be displayed on the
Repeater.
Regardless-of the
s
e
tt
.
i
n
g
s on the GPS Receiver,
the
repeater
always
displays dis
t
a
n
c
es
in Nautical miles, speeds in knots,
and all bearings in magnetic. Latitude
and
Longitude is shown
in
degrees,
minutes and tenths, hundredths and thousandths
of
a
minute.
USING THE REPEATER
Press POSN. at any time, and the repeater will
display
the
current
position (Lat and Long) after
a brief pause
while it
collects the fresh
NMEA
data from
the
receiver. Unless a
waypoint i
s
selected on
the
receiver, this is usually all
the
data
available to the repeater.
Select a waypoint (a destination) on the GPS
r
ece
iv
e
r
and
press STEER. The repeater will show the Speed
over
the
ground (SOG)
s
c
re
en
. This screen shows
the road, the speed
over the
ground (the course made good), track, and distance
and bearing to the waypoint.
A
second
press of
S
T
EE
R shows the cross-track error
(CTE)
screen. This replaces the speed over ground with the CrossJ
track error, and leaves the
other values
as before. Pressing
S
T
E
ER alternates between
the
CTE
and SOG screens.
Press
D
E
S
T
.
to display
the
name of the next waypoint (which
has been entered into the GPS receiver) and the d
i
re
ct
i
o
n
to
steer to
reach
it.
If
the destination is
within
30°
of astern,
"Astern" is displayed.
Press LIGHT
to
switch
the
backlight on at low level, and again
to switch the backlight
to full brightness.
Another
press
switches
the
backlight off again.
5
USING THE ROADWAY DISPLAY
The roadway display is available on the DEST and COG and
CTE screens.
Steering guidance is represented on the roadway display. The
display indieates the direction to steer to reach the destination
from the
It does
.oQ1
indicate cross
track error from the track between the departure and
destination waypoints stored in the GPS receiver.
If the cross-track (CTE) is being displayed, the cross-track
error includes a Left (L) or Right (r) indication, which indicates
the direction to steer to
the
track
and
The roadway display always shows the best direction to turn,
even if the vessel is moving away from the destination
waypoint (and see above). If the vessel is going away from the
destination, this is shown by the large difference between the
bearing to waypoint (destination) and the Track.
The roadway displays are shown opposite, for all track and
bearing differences.
6
"Ahead"
Track within
3°
of bearing to destination
""
·
--
Steer left
Steer right
(Track >
3°
off bearing to destination)
�
.
-- fllrl
.
�
Steer left
Steer right
(Track>
6°
off bearing to destination)
f±J27-.... "".�\\:S::s;
Steer left
Steer right
(Track>
9°
off bearing to destination)
�
.
--fllrl
.
�
Steer left
Steer right
(Track > 12° off bearing to destination)
�.��.�
Steer left
Steer right
(Track > 15° off bearing to destination)
�' \\:S::s; f±J27. �
7
TECHNICAL INFORMATION
The GPS Repeater offers full functionality only when the
G
PS
receiver is set up to send NMEA
2.0
(or later) messages at
4800
baud. NMEA Message types RMB,
AMC,
and GSA are
required to
!
ulfil all the repeater's functions.
The repeater always shows the status of the signals it is
getting from the GPS receiver. If no NMEA data are being
received, a "No GPS Signal" message is displayed.
Some GPS receivers send NMEA data before full satellite
acquisition is achieved, but others wait until full acquisition is
achieved before sending any data over the NMEA connection.
If position (POSN.) is requested, and none is available from
the GPS, "No G PS POSN." is displayed. If no Cross-track
Error or Speed over Ground information is available,
appropriate messages are shown.
The Repeater always displays magnetic bearings, using the
magnetic offset sent by the GPS receiver. If true bearings are
wanted on the Repeater,
it
is necessary to set the GPS
Receiver to Magnetic, and set the magnetic deviation
manually to zero.
The cable to the Repeater has two wires, Red and Blue, and
an outer screen. The screen is negative, and the red wire is
connected to+
12
Volts. The Blue wire carries the NMEA data
from the GPS Receiver. The cable can be shortened or
extended up to
20
metres if desired.
Supply voltage:
8-16Volts D.C.
Current
3
mAmps (backlight
Off)
Current
25
mAmps (backlight On)
8
TROUBLE SHOOTING
PROBLEM
LIKELY
CAUSE
REMEDY
Repeater
is
No power to
Check 12V
supply, fuse,
totally
dead.
Repeater.
and
connections
between
the terminal
block and
1 Om
cable.
Check cable
for
damage .
Repeater
Not getting
NMEA
Check
GPS Receiver is
reports "NO
from
the GPS
set up to
send NMEA
GPS
Signal''.
Receiver.
version
2.0
(or
higher)
at
4800
Baud.
Repeater
Not getting
NM
EA
Check
GPS
Receiver is
reports
'NO
from
the GPS
on and has
acquired
GPS Signal".
Receiver.
lock. Check
ccnnections.
Repeater
No Waypoint
;
Select waypoint.
shows
"No
selected
on
GPS
GPS DEST"
Receiver.
or "No
GPS
SOG" or"No
GPS GTE".
Repeater
Receiver still
Wait
for acquisition.
shows "No
a
cquiring position.
GPS POSN".
Information
on
The Rece
i
ver
has
Wait
for
update.
R
ep
ea
t
e
r
not
updated
its
appears
NMEA
cutput.
different to
GPS Receiver.
TROUBLE SHOOTING
PROBLEM
LIKELY CAUSE
REMEDY
!
Information on
iRepeater
appears
different to
GPS
Receiver.
The Receiver
is not
Reset Receiver
show
set to display
knots,
Nautical
units.
Bearings are
different
on
the
Repeater.
nautical miles, etc.
The Receiver is
not
se
t
to
magnetic.
Left
and Right ' Difference in
symbols are
convention.
Some
reversed.
receivers show
I
di
re
c
t
ion TO
desired track,
others show your
position RELATIVE
to desired track.
Set
the
Receiver to read
Magnetic bea
ri
ngs. If
true
readings
are
desired, set Receiver to
magnetic, and
set
zero
magnetic deviation
..
Remember
the
I
co
n
ven
t
i
o
n in
use.