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Practice has shown over the last years that this gives a time accuracy of about 5 msec. My time servers were all operating as stratum 2 servers which indicates that they are the second computer in row connected to the time source. The number of hops between a time server and an accurate time source is normally called the stratum of that server. In general, the larger the number of hops between a computer and the original time source, the larger the error in synchronization will be. Until now I used other computers on the internet as time base for my servers, but recently I decided to setup my own accurate time source, based on a readily available GPS device. On NTP capable computers, a small program is running in the background which periodically checks the time on neighboring computers and adjusts the local time according to those values. NTP time servers use the Network Time Protocol to synchronize time and act as a time base for other computers in the network. I have been operating a number of NTP time servers for some years now on different continents on this globe. This, together with the broad availability of cheap GPS devices, makes the GPS system the ideal way for accurate time synchronization of computers.
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To calculate a position within meters, the time signal must be accurate within nanoseconds. This GPS signal can not only be used to calculate a position, but it can also be used as a very accurate time base. A GPS receiver will receive these signals and use geometric calculations to estimate the location of the receiver relative to those satellites. The GPS system allows a maximum of 32 satellites around the earth which each transmit their own position and time on a regular interval to the earth.
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The GPS satellites are part of the military navigation system of the US Army, but they also transmit navigation signals on public frequencies which are free to use by everyone. GPS or Global Positioning System is a navigation aid system which uses signals from satellites to calculate the actual position of a GPS capable receiver. Using the Garmin GPS for time synchronization.Mounting connectors to the Garmin 18x LVC.