engineering

IEC 61108

IEC 61108 is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand IEC 61108 rather than just read about it. In short: IEC 61108 is a collection of IEC standards for "Maritime navigation and radiocommunication equipment and systems - Global navigation satellite systems (GNSS)". The 61108 standards are developed in Working Group 4 (WG 4A) of Technical Committee 80 (TC80) of the IEC.

Key takeaways

IEC 61108 belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect IEC 61108 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of IEC 61108 from memory before moving on to harder problems.

Reference excerpt

IEC 61108 is a collection of IEC standards for "Maritime navigation and radiocommunication equipment and systems - Global navigation satellite systems (GNSS)". The 61108 standards are developed in Working Group 4 (WG 4A) of Technical Committee 80 (TC80) of the IEC.

Sections of IEC 61108 Standard IEC 61108 is divided into seven parts, each relating to a different GNSS system's receiver equipment, performance requirements, methods of testing, and required test results:

IEC 61108-1: Global positioning system (GPS) equipment IEC 61108-2: Global navigation satellite system (GLONASS) equipment IEC 61108-3: Galileo equipment IEC 61108-4: Shipborne DGPS and DGLONASS maritime radio beacons IEC 61108-5: BeiDou equipment IEC 61108-6: Indian Regional Navigation Satellite System (IRNSS) equipment IEC 61108-7: Satellite-Based Augmentation System (SBAS) equipment

IMO Resolutions The International Maritime Organization (IMO) has made several resolutions on performance standards of shipborne GNSS receivers, corresponding to the IEC standards for different GNSS constellations and receiver equipment. On 1 December 2000, the International Maritime Organization (IMO) adopted three resolutions regarding the performance standards for shipborne GNSS receivers:

IMO RESOLUTION MSC.112(73), corresponding to the IEC 61108-1 test standard IMO RESOLUTION MSC.113(73), corresponding to the IEC 61108-2 test standard IMO RESOLUTION MSC.114(73), corresponding to the IEC 61108-4 test standard On 5 December 2006, a fourth resolution was adopted:

IMO RESOLUTION MSC.233(82), corresponding to the IEC 61108-3 standard Further resolutions include IMO Resolution A.1046(27).

References

External links Official IEC website TC80 brochure Archived 2012-10-03 at the Wayback Machine "IEC 61108" at International Electrotechnical Commission

Worked examples

Example 1 — a first encounter with IEC 61108

Start with the simplest possible case. Write down what IEC 61108 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to IEC 61108 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about IEC 61108 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of IEC 61108

In research: IEC 61108 appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses IEC 61108 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: IEC 61108 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Electronic engineering, IEC standards, so understanding it makes those chapters shorter.
In everyday life: Look for IEC 61108 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study IEC 61108 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what IEC 61108 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain IEC 61108 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is IEC 61108 in simple terms?

Why does IEC 61108 matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study IEC 61108?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on IEC 61108.