MD69BC Bearing Circle for Bearing Repeater Compasses
The MD69BC is a traditional vane type Bearing Circle, allowing an observer to take a bearing of a distant object by aligning the two sighting vanes.
The MD69BC is a traditional vane type Bearing Circle. It allows an observer to take a bearing of a distant object by aligning the two sighting vanes with the object. The near vane contains a peep sight while the far vane contains a vertical sighting wire. A diametric horizontal wire from the near vane to the far vane enables the observer to read the bearing from the Compass Repeater card.
A reflector vane positioned behind the far vane allows the observer to observe azimuths of luminous celestial bodies (stars and planets) at various altitudes by picking up their reflection in the black mirror. When the body is observed, its reflection appears behind the vertical wire in the far vane. The MD69BC is supplied with a removable shadow pin which indicates the azimuth of the sun by the direction of its shadow.
CAUTION: This instrument is NOT suitable for taking direct azimuth sightings of the sun. For this we recommend the MARINE DATA MD69AZI Azimuth Sight which has a sun filter.
The instrument is finished in a semi-gloss black paint to complement other external marine navigation equipment and is supplied in a wooden instrument box.
The MD69BC Bearing Circle from MARINE DATA: flexible in application, easy to use and simple to maintain.
- Fits Standard 9.7 inch Diameter Compass and Compass Repeaters
- Folding Vanes
- Removable Shadow Pin
- For taking terrestrial and limited celestial bearings