Clocks and Meters
Founded in 2011, Kunshan EMF Marine Co., Ltd. is a professional company specializing in Chinese shipbuilding and marine engineering equipment. The company’s main products include marine fire-fighting equipment, life-saving equipment, navigation equipment, ship outfitting parts, navigation and measurement equipment, marine tools, and more.
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Nautical SextantThe Sextant GLH130-20/40 are precision marine navigation instruments designed for accurate angle measurement between two visible objects. It features a durable construction, typically with a...read more -
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Certification
The safety equipment we supply is approved by DNV, BV, RINA, LR, KR, ABS, CCS, and other classification societies, in accordance with international rules and resolutions for the marine and offshore industry.
Our Services
We also provide services such as product sourcing in China, procurement plan optimization, joint R&D, and supplying other specialized products based on customer requirements.
Production Market
After more than a decade of growth, we have established long-term, satisfying partnerships with over 200 professional customers from around the world, including Europe, the Middle East, Southeast Asia, South America, and North America.
A sextant is an instrument with the help of which one can measure a celestial object’s altitude above the horizon. Several terminologies are given to making this measurement by experts, such as taking a sight, shooting the object, or sighting the object. A sextant is used to measure an object’s angle. Moreover, one can also calculate the exact time of the measurement by using sextants.
Product Parameter (Specification)
|
Type |
GLH130-20 |
|
Measuring range |
-5~130 degree |
|
Accuracy |
(+,-) 10" |
|
Readability |
12" |
|
Working Temperature range |
-30°~+50℃ |
|
Telescope |
3.5x40 |
|
Lamp voltage |
3V |
|
Net weigh |
1.8kg |
|
Type |
GLH130-40 |
|
Measuring range |
-5~130 degree |
|
Accuracy |
(+,-)20" |
|
Readability |
12" |
|
Working Temperature range |
-30°~+50℃ |
|
Telescope |
3.5x40 |
|
Lamp voltage |
3V |
|
Net weigh |
1.2kg |
Advantages of the Sextant
Independence from Electronics
Sextants require no batteries or electronic components, making them reliable in any condition.
Accuracy
With proper use and calibration, sextants provide highly accurate measurements of celestial angles.
Skill Development
Learning to use a sextant hones navigational skills and enhances understanding of celestial mechanics.
Types of Sextants
There are three types of sextants, and they are as follows:
Nautical Sextants
Box Sextants
Sounding Sextants
- Nautical sextants are used for navigational needs on ships and boats.
- Experts use them for astronomical needs to carry out angular calculations between celestial bodies.
- The calculation of the angles may take place in any plane with the help of nautical sextants. This calculation can be in the object plane or the telescope plane.
- The calculation of the vertical angles with nautical sextants can take place by reducing its horizontal angles.
The Anatomy of a Sextant
The sextant is a remarkably simple piece of equipment and quite robust, which explains why it is still in use over two and a half centuries since its invention. Despite the advent of GPS systems, navigators still like to have one as electronics are known to fail. It is made up of a few basic parts:
The frame — This is the "sextant" part of the device, forming one-sixth of a circle
The horizontal mirror —The semi-silvered mirror you use to look at the horizon, which is attached to the frame
Telescope — You look through this to observe the horizon and the reflected image
The index mirror — The mirror on the movable arm that reflects the bright object you wish to measure
Horizon and index shades — These prevent unwanted light and glare from appearing in your view or damaging your eyes
Index arm — Moves the index mirror
Graduated arc — Shows the angle of the index arm in degrees
Vernier scale — Shows minutes of arc
Micrometer drum — Shows seconds of arc
Thimble — Allows fine movement of the index arm on the micrometer drum
Clamp — Enables you to lock the index arm in place
Customization Process
Set a Strategy
Determine quantity, style and delivery time.
Sign Contract
Provide efficient, high-quality services.
Production
Strict control and quality control at all levels.
Delivery
Delivery to customers according to contract time.
We're well-known as one of the leading clocks and meters manufacturers and suppliers in China. If you're going to buy high quality clocks and meters made in China, welcome to get more information from our factory.
clocks and meters, Nautical Sextant, Ship Nautical Sextant