science

Satellite emergency notification device

Satellite emergency notification device is a science 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 Satellite emergency notification device rather than just read about it. In short: A Satellite Emergency Notification Device (SEND) is a portable emergency notification and locating device which uses commercial satellite systems rather than the COSPAS-SARSAT satellite system. An example of this device is SPOT.

Key takeaways

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

Reference excerpt

A Satellite Emergency Notification Device (SEND) is a portable emergency notification and locating device which uses commercial satellite systems rather than the COSPAS-SARSAT satellite system. An example of this device is SPOT. The devices use an internal GPS chip to gather location information. When the SEND is triggered, this information is sent via commercial satellite to a commercial monitoring agency whose role is to pass the information to an appropriate responding agency. The responding agency contacted depends, in part, on the location. Examples of responding agencies would be military Search and Rescue, Coast Guard, local police, voluntary Search and Rescue. Typical users/purchasers of these devices are participants in activities such as hiking, mountain biking, climbing, boating and flying. They are also useful for those who work in remote areas (loggers, foresters, geologists, fisheries and wildlife staff). Additional features are increasingly being offered: sending preprogrammed messages, breadcrumb tracking via Google Earth. Some newer devices offer two-way communication via satellite, for example Garmin's inReach Communicator, the Yellowbrick 3 Messenger/Tracker, and the Somewear Global Hotspot. The considerations when buying them, is ensuring that the International Emergency Response Coordination Centre (IERCC) which receives a distress call maintains an accurate and up-to-date database of response agencies to contact and can quickly determine which is appropriate to the situation/location. The commercial, IERCC is GEOS, used by both SPOT and DeLorme SENDs. The US Coast Guard's National Search and Rescue Committee (NSARC) set up a working group which includes representation from other US agencies, international organizations and device manufacturers to discuss how these "technologies can be properly reviewed and integrated with the SAR response system in the United States" and to aid the Radio Technical Commission for Maritime Services (RTCM) in "development of a minimum operating and performance specification for such devices". The RTCM working group SC has completed and approved a standard for Emergency Satellite Notification Systems, which was published in August 2011.

Garmin Device

inReach, like SPOT, does not use the 406 MHz signal nor the system of satellites. Instead, it depends on the Iridium satellite constellation. Unlike SPOT, inReach is a two way system capable of receiving confirmation that the message was received. Like SPOT, the message is transmitted to the private Garmin Response//Garmin IERCC(FORMALLY GEOS International Emergency Response Center) who then notifies the appropriate SAR authorities. inReach also provides tracking capability and two way SMS text messages.

Somewear Global Hotspot The Somewear Global Hotspot, like inReach, also depends on the Iridium satellite system. It enables two-way messaging, live tracking, and 24-hour weather forecasting. In the event that an SOS distress signal is triggered, the information is transmitted to the GEOS who coordinates the rescue with the appropriate local authorities.

SPOT

SPOT does not use the 406 MHz signal nor the system of satellites. Instead, it depends on the GlobalStar satellite system. It has richer features (for instance, can send many non-emergency signals) – but it does not work in as many places as 406 MHz PLBs – for instance under dense forest canopy or steep canyons. When a user presses the "911" button on a SPOT device an emergency message containing the unit's identification and GPS location is transmitted to the GEOS International Emergency Response Center who then notifies the appropriate emergency agency for the region after first calling the user to ensure the transmission is not accidental. SPOT additionally has the ability to provide non-emergency web based tracking information. This allows family or friends at home to track the holder's progress. The tracking operates by sending a tracking signal to the GlobalStar network every 10 minutes. This feature can additionally be useful to provide location of an individual even if the individual is unable to activate the emergency '911' button.

Yellowbrick Yellowbrick, like SPOT, does not use the 406 MHz signal nor the system of satellites. Instead, it depends on the Iridium satellite system. Unlike SPOT, Yellowbrick is a two way system capable of receiving confirmation that the message was received and exchange two-way messages via short emails and SMS. Alert messages are transmitted to destinations specified by the owner.

See also Emergency locator beacon Emergency position-indicating radiobeacon station, which covers PLB, ELT, EPIRB

References

https://www.iercc.com/en-US/ https://www.garmin.com/en-US/blog/outdoor/get-to-know-garmin-response/ https://www.iercc.com/en-US/supported-devices/

External links BriarTek claims patent on SENDs Archived 2013-12-09 at the Wayback Machine Announcement By DeLorme of the inReach Communicator Announcement by Yellowbrick of their tracking and communication device SEND standard approved by RTCM

Worked examples

Example 1 — a first encounter with Satellite emergency notification device

Start with the simplest possible case. Write down what Satellite emergency notification device claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Satellite emergency notification device 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 Satellite emergency notification device 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 Satellite emergency notification device

In research: Satellite emergency notification device appears in science 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 Satellite emergency notification device 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: Satellite emergency notification device is common in secondary-school and first-year university syllabi. It links to neighbouring topics Beacons, Emergency communication, International telecommunications, so understanding it makes those chapters shorter.
In everyday life: Look for Satellite emergency notification device 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 Satellite emergency notification device in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Satellite emergency notification device 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 Satellite emergency notification device out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Satellite emergency notification device in simple terms?

Why does Satellite emergency notification device matter?

Because it connects several science 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 Satellite emergency notification device?

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 Satellite emergency notification device.