About GPS

GPS is short for Global Positioning System. The name says exactly what GPS is, namely a system that can be used around the earth to determine where you are. The GPS system was developed by the Department of Defense of the United States under the name of NAVSTAR GPS. The first satellite was launched in 1978. In 1995 there were 24 active satellites and the system was fully operational. From 1995, there are still satellites sent into space to replace failed ones and expand the system up to now 32 active GPS satellites.

The signal transmits a GPS satellite contains information such as the number of the satellite, the location of the satellite in space, and the date and time that the signal was sent. A GPS receiver thus knows when the signal was transmitted. The receiver also knows when the signal is received because an internal clock is in the GPS. GPS also knows how quickly the signal went through the area (299,792 km / s). With all these data, the GPS determine the distance to the satellite.
Because a GPS receiver knows where you are, it can also indicate the direction to a specified destination. A GPS (GPS receiver is often called GPS or GPSr) thereby replacing map and compass. And that’s good news for anyone who is not as easy as that, because navigating with a GPS is very simple. The satellite signals are also free and open to everyone.

The GPS receiver combines the distance to the satellite with the information on the location of the satellite. This brings GPS into a number of options where you can be in the room. Forming potential locations as it were a sphere around the satellite. If you receive a signal from a second satellite, you find yourself at the intersection of two spheres (which is a circle). And if you receive signals from three satellites, hold only two points on which all three spheres have in common. One of those points is usually not on the earth, so you know your position. The signal from a fourth satellite makes final location and is used to make more accurate the positioning. That accuracy is approximately 3 meters in the open field.
The GPS system consists of three parts: satellites, ground stations and receivers. The satellites are the heart of the system. There are currently 32 active GPS satellites. They run in six orbits around the Earth at about 20,000 km altitude. The speed of these satellites is so great (approximately 11,000 km / hr) that they once every 12 hours to go around the earth. Continuously they send signals to Earth. These signals can be received by GPS receivers, which they use to determine your position on earth. check the ground and the correct operation of the satellites.
More about phone tracking app best can be found in our booklet About GPS. In the book All about GPS is in a very accessible way explains what GPS is and how you can go hiking, and biking. We look at the use of coordinates, waypoints, routes, maps, Basecamp, POIs etc. The book also includes our acclaimed Do-It-Yourself course. On the basis of clear practical exercises anyone can handle a GPS learning. There are various techniques that can improve the positioning accuracy.


This involves the use of correction signals from ground stations (DGPS). WAAS and EGNOS in Europe, in America are examples of DGPS. Waas / EGNOS is built into the present and GPS, but adds in practice not much matter because the signals from the WAAS / EGNOS satellites can not be well received. GPS is not the only satellite navigation system. Russia has a system called GLONASS. Europe also is working on a satellite navigation system. That system called Galileo. In 2019, Galileo should be operational.

Snapchat and Google ally with the press in France to combat false information

Among the eight media outlets in France who were allied with France Médias Monde Snapchat group set – which includes RFI and France 24 – Le Monde newspaper and magazine L’Express, Agence France Presse and BFM television news.


Under pressure, incentive to better tackle the misinformation – or “fake news” as they are called – after being regarded as a striking feature of the recent electoral campaign in the US, the social network created by Mark Zuckerberg established since America December 5 device in collaboration with media outlets there. After France, Snapchat plans to continue cooperation with other countries, Germany is next on the list.

Specifically, Snapchat will allow users to report information which they consider false. All such information will be reported together in a portal with access to media partners. They can then verify that information. If at least two media outlets, two publications therefore determined that the content is false then it will be signaled with a flag that Snapchat users will remember that two “fact-checkers” have questioned the veracity of that information. If Snapchat users will want to pass on this content “dubious”, a message will alert. In addition, such content can not be exploited untruthful advertising.

In a commentary that resembles but rather a justification Director Le Monde explains why he hesitated to accept this collaboration.  The eight media outlets engaged in this operation, however, insists on its experimental nature. A first assessment will be done in two months but already it is assumed that job sharing will be extended.

In parallel with this collaboration Snapchat with eight media outlets in France, First Draft News Network in collaboration with Google will launch in late site “crosscheck”. 16 editorial partner – again including AFP, Le Monde, France Médias Monde and France Télévisions – will work together to identify and verify the content circulating online – news, photos, videos or comments. As in the previous case, the public is invited to attend signaling suspicious content.


A team of journalism students, formed by Google, will summarize and then be put back in context every rumor or allegation unfounded photomontage. The flow thus created will be supervised by Agence France Presse. “Competition between media is not stake when it comes to combat misinformation and manipulation.

Snapchat mobile app and desktop site began propagating a new section dedicated to weather forecast. The claim that Snapchat already at 95% of its users can access the new feature and that in the coming days, it will be available to everyone.

The new weather section of Snapchat is an upgrade to the message that sometimes have their social network users and includes the current temperature. Through it, users can now access a special section dedicated to weather forecast.

In addition to greeting the feed, the new feature can be accessed from the More section, where Snapchat cram all auxiliary functions of the feed, as well as groups and pages.

The new weather section from Snapchat only provides information on the maximum and minimum temperatures, provided by, lacking a dedicated application scope, informing the user about many other aspects forecast as wind power, chance and rainfall etc.

In addition, Snapchat will also provide notifications on weather conditions. For now, the notifications are in test phase, to be implemented in their final form by the end of this month.

For snapchat password hack, the new section dedicated to weather conditions is part of a series that seems endless amenities that are designed to keep as much captive user in their social network ecosystem.