SILVA C58 for Car and Boat Compass Instruction Manual
- June 9, 2024
- SILVA
Table of Contents
SILVA C58 for Car and Boat Compass
SILVA MARINE COMPASS 58
Thank you for choosing the SILVA Compass 58. This compass is suitable for
small boats and recreational vehicles. It has a permanent and/or detachable
bracket, mounts vertically, hori-zontally, upside down or anywhere in between.
Maximum tiltingangle is 200 in all directions. It’s supplied with a front
black main lubber line and comes with the feature of a direct reading scale.
Built-in adjustable compensation magnets for the B- and C- coefficients makes
it easy to find the correct direction and a built-in red LE.D. illumination
for 12V enables night vision.
PRODUCT OVERVIEW
The packaging includes:
- Compass unit
- Mounting bracket
- Illumination
- Compensator adjuster
ILLUMINATION
This compass comes with a built-in red illumination (12V).
POSITIONING
For maximum accuracy and performance, select a location easily visible to the
operator and with minimum magnetic interference.
Important: Before installing compass permanently, adjust in selected location
to be sure it can be properly compensated. Electric motors, stereo speakers
and windshield wiper motors often cause magnetic interferences. Deviation of
up to +1-450 can be compensated for.
MOUNTING
Compass should be level and aligned parallel with centerline of vehicle/boat. The compass should be mounted on a firm base (especially important for speedboats).
Permanent mounting
- Loosen the bracket from the compass with the two shaft screws.
- Mount the bracket on a suitable position with two non- magnetic brass screws.
- Mount the compass on to the bracket with the two shaft screws and fix the compass in the correct reading position.
Detachable mounting:
- Use the fixing Plate and mount it in a suitable position with four non-magnetic brass screws.
- Slide the compass on to the fixing plate.
- Adjust and fix the compass in the correct reading position with the two shaft screws. To be able to use several mounting positions, extra fitting plates are available (art.no 35728-8 Blue, art.no 35728- I White, art.no 35728-0 Black). Installation suggestion: For easy removal, use double faced tape or velcro.
COMPENSATION AND DEVIATION
Compensation is recommended if the deviation is more than 5 degrees, when the
compass is in its normal mounting position.
If the error is less than 5 degrees, it is suffcient to produce a deviation
table.
Compensation is made with the two compensation adjuster screws “E/W” and “N/S”
in order to reduce the errors surface stablesources caused by iron objects or
other sources of mag-netic disturbance. The compensation adjuster screws are
situated and marked at the front “E/W” and on the right side “N/S” of the
compass housing. The slotted edge of the adjuster screws should be horizontal
before starting the compensation procedure. A small non-magnetic screwdriver
is provided for adjusting purposes.
When compensating, the boat should be in an area that is not affected by permanent or electromagnetic disturbances.
- Aim the boat due North and turn the ”N/S” screw until the compass reading is 0°.
- Aim the boat due East and turn the ”E/W” screw until the compass reading is 90°.
- Aim the boat due South. If the compass does not show 180°, turn the ”N/S” screw until the error is halved. (E.g. If the error is 6° – turn the screw until the error is 3 °.)
- Aim the boat due West. If the compass does not show 270°, turn the screw until the error is halved.
- Go through the procedure again and check the adjusted values.
- Check the compass every 20 degrees and produce a deviation table and deviation curve. As the magnetic conditions in a boat are liable to change, we recommend checking of the compass once a year and always after the installation of equipment that might affect the compass.
NB! Do not regard the compass as an accurate navigational instrument until the compensation is carried out and the deviation table is produced. Whenever in doubt, please seek the advice of a compass adjuster!
MAINTENANCE
To clean the compass, use a mild soap solution or detergent. Do not use strong
solvents, such as spirit, acetone or petroleum.
The compass tolerates temperatures down to -30°C. It is advisable not to
subject it to severe cold for long periods.
TECHNICAL SPECIFICATIONS
- Type of compass: Powerboat compass
- Illumination: Yes, 12V. Color: red
- Lubber lines: 1, center (front)
- Gimballed cradle: No
- Accuracy: ±1°
- Apparent card diameter: 55mm
- Compensator: Yes
- Card type: Cone
- Card graduation: Edge: every 10°
- Heeling angle: Roll: 20° Pitch: 20°
- Heeling angle scale: No
- Mounting: Bracket
- Mounting angle: Any
- Temp operating range: -10°C to +70°C
- Material: Acrylic/ABS
- Weight: 205g
- Dimensions:
PROTECT THE ENVIRONMENT.
The Compasses should be recycled and must not be thrown in the regular trash.
Dispose these items in accordance with applicable local regulations.
For more information please visit www.silvasweden.com