MD69AZI DATASHEET

MD69AZI DATASHEET

MD69AZI DATASHEET

Product catalog summary
Overview: The MD69AZI is a precision azimuth reading device designed for accurate bearings of celestial bodies and landmarks. It follows the William Thomson (Lord Kelvin) pattern and is compatible with the MD69BR Bearing Repeater. The device is finished in jet black semi-gloss paint and comes with a varnished marine plywood case for storage.
Applications: The MD69AZI is used for taking accurate bearings of the sun, celestial bodies, and terrestrial landmarks with the MD69BR Bearing Repeater.
Features: The device includes a UV sun filter, neutral density filters, and is constructed from marine-grade naval brass. It is designed for precision and ease of use.
Environmental Specifications: Operating temperature ranges from -10°C to +70°C. The compass safe distance is 50 cm.
Physical Specifications: The device weighs 1.93 kg and has dimensions of OD Ø 257mm, ID Ø 246.4 mm, and height 134 mm. It fits the MD69BR Bearing Repeater and includes a rotating 60° triangular prism and collimating lens.
Operational Methods:
  • Method 1: For landmarks or low luminosity objects near the horizon, set the prism adjustment thumbwheels down. Maximum altitude is approximately 34° above the horizon.
  • Method 2: For the sun or celestial objects high in the sky, set the prism adjustment thumbwheels up. Maximum altitude is approximately 60° above the horizon.
Additional Information: Always use sun filters when taking azimuth bearings of the sun. The design is based on a pattern developed by Sir William Thomson in the 1880s.
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Catalog excerpts

MD69AZI DATASHEET-1

COMPASS & HEADING / BEARING REPEATERS / ACCESSORIES MD69AZI AZIMUTH SIGHT FOR BEARING COMPASS REPEATERS SKU: F069051 View Online › OVERVIEW The MD69AZI is a precision Azimuth reading device designed for taking accurate 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 Jet black (RAL9005) Semi-gloss Paint to complement other marine equipment. The MD69AZI is supplied complete with a varnished marine plywood instrument case for safe and convenient storage. A Precision Azimuth Reading Device The MD69AZI Azimuth Sight from Marine Data: easy to use and simple For taking accurate bearings of the Sun, other Celestial Bodies and Terrestrial Landmarks William Thomson (Lord Kelvin) Pattern For use with the Marine Data MD69BR Bearing Repeater Equipped with UV Sun Filter and Neutral Density Filters For taking accurate bearings of the Sun, other Celestial Bodies Marine Grade Naval Brass Construction and Terrestrial Landmarks with the Marine Data MD69BR Bearing Repeater. RELATED PRODUCTS NAVIGATION INNOVATION

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MD69AZI DATASHEET-2

ADDITIONAL INFORMATION Thomson pattern azimuth reading device group II Always use the sun filters when taking azimuth bearings of the sun; never attempt to take bearings of the sun with unprotected eyes Fits the MD69BR Bearing Repeater; bezel Ø 9.7 inch (246.4 mm) Supplied in a wooden instrument case MD69AZI-BX Rotating 60° triangular prism, 30 mm length 1x UV filter (SchottTM RG780); 1x neutral density filter (SchottTM NG1) Collimating Lens: 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...

 Open the catalog to page 2

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