The MD69AZI is a precision Azimuth reading device designed for taking accurate compass bearings of the sun and other celestial bodies and landmarks.
Based on the William Thomson (Lord Kelvin) Pattern, the MD69AZI is designed for use with the MD69BR Bearing Repeater and finished in satin jet black paint to complement other marine equipment. The MD69AZI is supplied complete with a varnished marine plywood instrument case for safe and convenient storage.
The MD69AZI Azimuth Sight from Marine Data: easy to use and simple to maintain.
- A Precision Azimuth Reading Device
- For taking accurate compass bearings of the Sun, other Celestial Bodies and Terrestrial Landmarks
- William Thomson (Lord Kelvin) Pattern
- Equipped with UV Sun Filter and Neutral Density Filters
- Marine Grade Naval Brass Construction
- For taking accurate compass bearings of the Sun, other Celestial Bodies and Terrestrial Landmarks alongside the Marine Data MD69BR Compass Bearing Repeater.
- Type: Thomson pattern azimuth reading device, Group II
- Weight: 1.93 kg
- Dimensions: OD Ø 257mm; ID Ø 246.4 mm (9.7 inch); H 134 mm
- Mounting: Fits the MD69BR Bearing Repeater; bezel Ø 9.7 inch (246.4 mm)
- Reflector: Rotating 60° triangular prism, 30 mm length
- Sun Filters: 1x UV filter (SchottTM RG780); 1x neutral density filter (SchottTM NG1)
- Collimating Lens: Focal length 100 mm; Ø 33 mm
- Spirit level: Sensitive to tilt of <1°
- Construction: Marine Grade Naval Brass
- Finish:RAL9005 satin black paint
- IP rating: n/a
- Operating temp: -10°C to +70°C
- Compass: Safe Distance 50 cm
- The MD69AZI meets ISO 25862 for the testing and certification of Group II azimuth reading devices
Always use the sun filters when taking azimuth bearings of the sun; never attempt to take bearings of the sun with unprotected eyes
- This pattern of azimuth sight was originally developed by the British physicist Sir William Thomson (Lord Kelvin) (1824-1907) and introduced in the early 1880s
- Supplied in a wooden instrument case MD69AZI-BX
METHOD 1 – To take bearings of landmarks or low luminosity objects near to or on the horizon (set the arrow on prism adjustment thumbwheels = DOWN). A distant object is sighted directly by the eye and the compass card simultaneously viewed indirectly through the prism. Max. altitude approx. 34° above horizon.
METHOD 2 – To take bearings of the sun or other celestial objects high in the sky (set the arrow on prism adjustment thumbwheels = UP). The compass card is viewed directly through the collimating lens and a distant object simultaneously viewed indirectly through the prism. Max. altitude approx. 60° above horizon.