<div dir="ltr">Ora aqui está uma decisão inteligente. Os sistemas mais antigos, podem ser hoje considerados como "arcaicos" pelos mais jovens, que nem sequer entendem como funcionavam. No entanto, como eram sistemas bastante mais simples e principalmente independentes, a sua fiabilidade era de longe superior aos sistemas actuais. Podiam não ter um precisão de 2m, mas os 100m na melhor das hipoteses, eram mais que suficientes. Eu continuo a ser adepto do "KISS" Antigamente havia uma rede de VHF analógico para bombeiros, serviços florestais, ...Uma rede de ondas curtas para PSP, GNR etc, e tudo funcionava bem. Hoje existe um manancial de sistemas, que estão sempre com problemas começando pelo célebre SIRESP. Enquanto os decisores não se voltarem mais para sistemas "KISS" não se adianta muito, a não ser na área das negociatas.</div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div><br></div><div><br></div><div><b>Cumprimentos: Carlos Mourato - Sines - Portugal</b></div><div><br></div><b>Best regards from: Carlos Mourato - Sines - Portugal</b><div><b><br></b></div><div><b>Visite o meu canal Youtube em:</b></div><div><a href="http://www.youtube.com/user/CT4RK?feature=guide" target="_blank">http://www.youtube.com/user/CT4RK?feature=guide</a> <b><br></b><div><b><br></b><div><b>Visit my youtube channel at:</b></div><div><a href="http://www.youtube.com/user/CT4RK?feature=guide" target="_blank">http://www.youtube.com/user/CT4RK?feature=guide</a> <b><br></b><br><div><br><br></div></div></div></div></div></div></div>
<br><div class="gmail_quote">2014-11-04 13:43 GMT+00:00 João Costa > CT1FBF <span dir="ltr"><<a href="mailto:ct1fbf@gmail.com" target="_blank">ct1fbf@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">GPS back-up: World War Two technology employed<br>
<br>
Technology developed during World War Two is to be used as a back-up for GPS.<br>
<br>
The General Lighthouse Authorities (GLA) have announced that they have<br>
installed a system called eLoran in seven ports across Britain.<br>
<br>
The GLA say many critical instruments on ships use Global Navigation<br>
Satellite Systems, and if they fail the consequences could be<br>
disastrous.<br>
<br>
The new system, which is ground rather than satellite-based, is<br>
designed to be used in the event of a GPS failure.<br>
<br>
"All vessels that sail today are massively dependent on GPS, " Martin<br>
Bransby, research and radio navigation manager for the General<br>
Lighthouse Authorities of the UK and Ireland, told the BBC's<br>
technology programme Click.<br>
<br>
"It is their primary means of navigation - and a massive number of<br>
instruments rely on it too.<br>
<br>
"If you don't have it, you are dead in the water."<br>
<br>
Testing for eLoran has taken place in Felixstowe, the busiest<br>
container port in the UK.<br>
<br>
Each year, three million containers are brought in on some of the<br>
biggest ships in the world.<br>
<br>
Safely manoeuvring these vessels in this packed waterway is vital, and<br>
currently the only way to do this is with the help of GPS.<br>
<br>
Onboard the Galatea, a ship that is 80m (260ft) long, the GLA have<br>
been finding out what happens if the satellite system goes wrong.<br>
<br>
Martin Bransby demonstrates a GPS failure by pulling the plug on the<br>
ship's receiver.<br>
<br>
Within a few seconds, alarms start to sound on the bridge as one by<br>
one the instruments stop working.<br>
<br>
"This is the gyrocompass - it steers the ship - you can see it<br>
starting to fail," says Mr Bransby.<br>
<br>
"If we walk over here, this is the radar, and that's not working<br>
either. This is the dynamic positioning: it holds the ship's position,<br>
that's not working.<br>
<br>
"The electronic chart display becomes unusable. Even the ship's clock<br>
stops working."<br>
<br>
In a series of tests, the GLA have found that almost every bit of kit<br>
on the boat uses GPS - even the onboard satellite entertainment<br>
system.<br>
<br>
Mr Bransby says: "You can imagine standing watch on this ship, it's<br>
the middle of the night, it's dark, it's foggy, you are in the English<br>
Channel, and then this happens.<br>
<br>
"What do you do? You're in a right mess, basically."<br>
<br>
Read the full BBC News story at:<br>
<a href="http://www.bbc.co.uk/news/science-environment-29758872" target="_blank">http://www.bbc.co.uk/news/science-environment-29758872</a><br>
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