NASA Marine Cruiser Log Guía
NASA MARINE Ltd.
BOULTON ROAD
STEVENAGE
HERTS SG1 4QG
ENGLAND
(01438) 354033
MARINE INSTRUMENTS
Cruiser
INSTALLTATION AND
CONTEMPORARY STYLED INSTRUMENTS
FOR CABIN OR COCKPIT MOUNTING
USER INSTRUCTIONS
for
LOG, DEPTH
&
COMPASS
RoHS
2002/95/EC
Papago Steel grey
1
1: INTRODUCTION
Cruiser instruments are designed to operate from a 12 volt battery supply and
are supplied complete with sensors, displays and display mounting kits.
Prior to unpacking this instrument read and fully understand the
installation instructions. Only proceed with the installation if you are
competent to do so. Nasa Marine Ltd. will not accept any responsibility for
injury or damage caused by, during or as a result of the installation of this
product. Any piece of equipment can fail due to a number of causes. Do not
install this equipment if it is the only source of information and its failure could
result in injury or death. Instead return the instrument to your retailer for full
credit. Remember this equipment is an aid to navigation and not a substitute
for proper seamanship. This instrument is used at your own risk, use it
prudently and check its operation from tine to time against other data. Inspect
the installation from time to time and seek advice if any part thereof is not
fully seaworthy.
The surface of cruiser has an acrylic finish chemically bonded to a tough
plastic. To keep it looking good clean only with a damp cloth. Do not use
abrasive cleaners or solvents.
INSTALLING THE DISPLAY
2:
Cruiser instruments are waterproof when panel mounted and are designed
for open cockpit mounting.
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 boss is not sealed to allow free passage of air to and from the
unit. This prevents misting of the display.)
The positions for the fixing holes can be marked on the panel using the drill tem-
plate which is an integral part of the packing carton. Before drilling check that
there is sufficient space behind the panel to route the cables and to allow access
to tighten up the wing fixing nuts.
Drill the five holes and check that the unit fits. It may be wise to connect the
cables before finally fixing the unit in position.
A sponge rubber seal is provided which should be fitted into the slot in the back
of the instrument.
Fit the instrument into the panel and tighten up the four wing nuts finger tight only.
It is important that the sponge rubber seal makes good contact with the panel or
water may get behind the unit and enter the cavity behind the panel.
2
INSTALLING THE TRANSDUCER
ECHO SOUNDER
3:
3:1
The transducer can be mounted in one of three ways:
(a) The transducer face can be bonded directly to the inside of the hull.
(some energy is lost to the hull but the loss in performance is, for
most G.R.P hulls, hardly noticeable).
(b) A through hull mount is available from your dealer or direct from
www.nasamarine.com.
(c) The transducer can be positioned inside a GRP hull by means of an In Hull
Transducer kit available from your dealer or direct from www.nasamarine.com
This method of installation has the dual advantage that no hole is made in the
vessels hull and that the echo sounder and transducer can easily be removed for
examination or installation elsewhere. It should be mentioned however, that
although the accuracy will in no way be affected by installing the transducer
inside the hull, the maximum range sensitivity may be reduced, depending on the
thickness and quality of the glass fibre. The In Hull Kit is available direct from
NASA Marine or your local chandler. Whichever is selected the best location still
has to be found.
Select a position below the water level where the transducer will point substanti-
ally towards the sea bed and where the transducer and cable are kept well
clear of interference generating equipment. This position should be well clear of
large masses of bubbles or cavitation which would disrupt the signal.
To test the suitability of the location, press a little sticky chewing gum on the
surface of the transducer and stick it down to the inside of the hull (remove dirt
and oily residue first). The unit can then be tested. If the location is satisfactory
the chewing gum can be removed, and the transducer mounted using one of
the methods described previously. (Note: Do NOT shorten the transducer cable).
It is important that the face of the transducer is thoroughly bonded down to the
hull. A single air bubble will cause a considerable loss in performance.
The transducer and the place of mounting must be kept entirely free of any
antifouling compound as this can also effect the performance of the unit.
3
External electrical interference is characterised by persistent, random numbers
on the display which obscure the truth depth reading on the depth sounder.
This is caused by large amplitude voltage “spikes” generally associated with the
engine’s alternator and/or ignition system which has not been properly sup-
pressed. These “spikes” may find their way into the sensitive amplifier section
of the depth sounder in two ways:
(a) Through the craft’s common power supply or
(b) Through direct radiation from the source or interference.
To reduce the possibility of induced interference from the engine’s generator
and/or ignition system choose a position as far away from the engine as
possible and run the cable from the transducer as far as practicable from the
engine. Do NOT cut the transducer cable, but stow excess away from any possible
source of electrical interference.
3:3 CONNECTING THE DISPLAY
Connect the black wire to the negative supply and the red wire to the positive via
a 1/4 amp fuse. The red wire of the alarm is also connected to the positive
supply whilst the black wire connects to the green wire from the display unit.
The alarm is not watertight and must be mounted in a protected position. Plug
the transducer into the socket on the display unit.
3:4 SOUNDER OPERATION
Various operational parameters need to be set into the memory prior to use to
get the best from your Cruiser depth sounder. Once set, these parameters are
permanent and are not likely to require adjustment.
Most depth sounders measure the depth below the transducer. It is often more
convenient to display the depth below the keel. A facility has been included
where the vertical distance between the transducer face and the bottom of the
keel (the keel offset) can be programmed into the unit. The unit then reads the
true depth below the keel. (On delivery the keel offset is zero so the unit will read
the depth below transducer).
BACK LIGHT:
A quick press of the ENTER key will turn on the back light. A further quick press
of the ENTER key will turn the back light off.
3:2 NOTES ON ELECTRICAL INTERFACE
4
TO SET THE KEEL OFFSET
Put the unit into engineering mode. (This is achieved by turning off the power
supply to the unit and turning the power back on whilst the ENTER key is
depressed). The word ‘ENG’ will appear until the ENTER key is released.
Now use the up and down keys to enter the required keel offset. A long
press on the ENTER key will return to normal echo sounder operation.
SELECTING THE OPERATING UNITS (FEET OR METRES)
Put the unit into engineering mode (see above). A short press on the ENTER
key will swap the units from feet to metres. A long press on the ENTER key will
return to normal echo sounder operation.
SETTING THE SENSITIVITY THRESHOLD
Echoes received from near objects will clearly be larger than from more distant
objects. Echoes from keels or turbulence under the boat may be substantially
greater than echoes from the sea-bed and may cause the sounder to alternate
between the sea-bed and something more local. To overcome this problem, the
Cruiser sounder is fitted with variable swept gain. This reduces the sensitivity for
local objects, progressively increasing the sensitivity as depth increases. The
point at which the gain starts to rise is called the sensitivity threshold. The
sensitivity of the unit at depths below the sensitivity threshold will be
considerably reduced whilst above the sensitivity threshold the unit repidly
becomes more sensitive with increasing depth.
The sensitivity threshold is factory enter to 0.0 metres. To view the sensitivity
threshold press ENTER The value can be altered by using the up and down
keys. The value is then fixed in memory by pressing ENTER.
USING THE ALARMS
The alarm will sound if an echo is received which is shallower than the upper
alarm setting or deeper than the lower alarm setting. To view the setting of the
upper (shallow) alarm, press the up key. Return to sounder by pressing
ENTER. To view the setting of the lower (Deep) alarm, press the down key.
The setting can be altered by using the up and down keys. The new value
is entered and the unit returned to the echo sounder by pressing the ENTER
key. To enable the alarm, press the up and down keys simultaneously. A
‘bell’ symbol will appear to show the alarm is activated. When an alarm
condition is apparent the bell symbol will flash and the audible alarm will sound.
Pressing up and down keys again will disable the alarm. All parameters set
into the unit are held in memory even when the power is removed.
5
4: LOG
INSTALLING THE PADDLE WHEEL UNIT.
IMPORTANT: Read and fully understand the installation instructions and only
proceed if you possess the required skills and correct tools.
WARNING: Always wear safety glasses and a dust mask when installing to
avoid personal injury.
WARNING: Immediately check for leaks when the boat is put back in the
water.
WARNING: The O-rings must be intact and, the lower one,
properly lubricated to make a watertight seal.
CAUTION: Never use solvents or products that contain solvents which could
attack the plastic.
IMPORTANT: The sensor in manufactured from high impact polymer and is
designed for use on the outer skin of a fibre glass hull. Never install the sensor
in a wooden hull, since swelling of the wood could fracture the plastic.
IMPORTANT: Ensure the hull is of constant thickness under the skin fitting
flange so the nut will fit squarely against the hull.
The paddle wheel should be installed at a point in the hull where:-
1/ It is immersed at all attitudes under power or sail.
2/ The blades of the paddle wheel are presented with a smooth flow of
water corresponding to the vessel's speed through the water. On displacement
hulls this is usually about amidships, but on planing hulls it should be as far aft
as possible.
3/ It should be easily accessible in the bilges for cleaning and laying up.
A blanking cap is provided to seal the skin fitting when the paddle wheel is
removed.
4/ It is not vulnerable to damage from unforgiving surfaces such as
trailers and lifting slings.
Once a suitable location has been selected, with the boat out of the water, drill
a 42mm hole perpendicular to the hull from the outside of the boat. Now sand
and clean the hole, inside and outside, to ensure the sealant will properly
bond to the hull.
6
4:2 CONNECTING THE DISPLAY
Connect the black wire to the negative supply and the red wire to the positive
via a 1/4 amp fuse. Plug the paddle wheel unit into the socket on the
display unit.
4:3 LOG OPERATION
When switched on the display will momentarily display the total distance and
then revert to reading speed. The speed is shown in nautical miles per hour
and is reliable up to 25.0 knots. (At higher speeds cavitation around the
paddle wheel may reduce accuracy).
A short press of the SPEED key will turn the backlight on and off.
Using a proprietary brand of marine silicone sealant, apply about 2mm of
sealant around the skin fitting flange where it contacts the hull and also up the
sidewall to a distance 3mm higher than the combined thickness of the hull and
the securing nut. This will ensure there is sealant in the threads to seal the hull
and to hold the nut securely in place. The nut has a groove on its underside
which should also be filled with silicone. From the outside of the hull, push the
housing into the mounting hole using a twisting motion to squeeze out excess
sealant. With someone outside holding the skin fitting in position, from the
inside apply a 2mm thick layer of sealant around the hole equal to the
diameter of the securing nut. Carefully tighten down the nut taking care not to
over tighten it, just over finger tight is enough.
Carefully remove all surplus sealant from the inside and outside of the hull and
leave until the sealant has cured. It is recommended that the area around the
skin fitting is thoroughly cleaned and the whole assembly be fibre glassed into
the hull as shown in fig 2. ensuring that the top 20mm of thread remains free of
sealant.
Figure 2 - Paddle Housing Installation (Sectioned view)
HULL
20mm
MINIMUM
SECURING
NUT
SILICONE
SEALANT
Housing
G.R.P.
42mm
Hole for paddle wheel unit
NOT TO SCALE
7
A short press of the TRIP key will display the Trip distance. To reset the trip to
zero first select trip by pressing the TRIP key. When the trip distance is shown
press and hold the TRIP key until the display shows ’F’. The trip is then reset
to
zero. The trip distance is shown in tenths of nautical miles up to 99.9nm and in
single miles up to 999nm thereafter.
A short press of the TOTAL key will display the total distance. The unit will
display the total distance travelled to 999 nautical miles. This counter cannot
be reset.
A long press of the SPEED key will return to the speed display
CALIBRATION
The calibration is preset in the factory. The type of hull and the position of the
paddlewheel may affect the performence of the unit. If the log under or over
reads then the calibration factor can be adjusted to compensate.
Enter the Engineering mode by first turning off the power supply to the
instrument. Press and hold the SPEED key whilst the power supply is turned
back on. The word ENG will appear on the display. Press either the TRIP or
TOTAL keys to display the calibration setting. This is normally 100(%) when it
leaves the factory. Press TRIP to increase or TOTAL to decrease the number.
Each press will increment or decrement the number by 1%. When the desired
calibration factor is attained a long press of the SPEED key will return the unit
to normal operation. Both speed and distance are calibrated simultaneously.
The calibration factor is stored in a non-volatile memory and is retained when
power is off.
8
ENTER
5: COMPASS
5:1 INSTALLING THE SENSOR.
The sensor measures the direction of the Earth’s weak magnetic field, and so is
sensitive to other magnetic fields which can affect the unit’s accuracy. It should
therefore be positioned carefully. Select a position as far as possible away from
large ferrous objects such as engines, and items such as DC motors or loud-
speakers which have powerful permanent magnets in them. Check also for small
ferrous objects close to the mounting location such as screws, nails, hinges etc.
These can become magnetised and cause errors. When a likely location has
been found, a check for reasonable accuracy can be made with a hand bearing
compass to confirm its suitability.
The magnetic sensor itself is gimballed within the housing. To accommodate
pitch and roll motions most effectively, mount the sensor as near to horizontal as
possible. For best performance in rough weather conditions, it is also advisable
to mount the sensor in a position (usually amidships) that minimises lateral
accelerations due to pitch and roll. Avoid mounting the sensor high above the
water line because doing so also increases pitch and roll accelerations. The sen-
sor is waterproof to CFR-46 standard. Ensure the sensor does not become sub-
merged.
Position the sensor and mark and drill pilot holes for the mounting screws to
allow the sensor to be rotated to align it exactly with the vessel’s axis. Now
mount the sensor carefully in position using non-magnetic screws. The rotational
position of the sensor should be chosen to ensure that the arrow points as close
as possible fore-and-aft.
5:2 CONNECTING THE DISPLAY
Figure 1
ENTER
Cruiser
COMPASS
ALARM
BLEEPER
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