What is GPS?
The Global Positioning System (GPS) provides geolocation and time information to a GPS receiver in all weather conditions, anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites. The GPS system operates independently of any telephonic or internet reception, though these technologies can enhance the usefulness of the GPS positioning information.
How does GPS work?
GPS satellites circle the earth twice a day in a very precise orbit and transmit signal information to earth. GPS receivers take this information and use trilateration to calculate the user's exact location. Essentially, the GPS receiver compares the time a signal was transmitted by a satellite with the time it was received. The time difference tells the GPS receiver how far away the satellite is. Now, with distance measurements from a few more satellites, the receiver can determine the user's position and display it on the unit's electronic map.
How accurate is GPS?
As of early 2015, high-quality, FAA grade, Standard Positioning Service (SPS) GPS receivers provide horizontal accuracy of better than 3.5 meters, although many factors such as receiver quality and atmospheric issues can affect this accuracy. GPS is very accurate, even in dense cities though it doesn't work indoors.
What is a GPS Watch?
A GPS watch is a device with integrated GPS receiver that is worn as a single unit strapped onto a wrist, in the manner of a watch. The watch can have other features and capabilities depending on its intended purpose and be an smart watch. The watch uses the Global Positioning System (GPS) to determine and track its precise location. The recorded location data can be stored within the tracking unit, or it may be transmitted to a central location data base, or Internet-connected computer, using a cellular (GPRS or SMS), radio, or satellite modem embedded in the unit. This allows the asset's location to be displayed against a map backdrop either in real time or when analysing the track later, using GPS tracking software.
How do the GPS Kids Watches work?
The GPS Kids Watches have built-in GPS receivers and are designed to operate on a GSM network, so they will not fully power without a SIM card. These devices can transmit audio when activated, and a SIM card is what allows this to happen. Features activated such as transmitting location, sending audio, receiving commands to turn on audio and other advanced features.