2. with a USB interface, you can watch the computer positioning effect directly phone line.
3. with the passive ceramic antenna and passive antenna amplifier, make better use of the individual effects.
4. with SMA interface can be directly connected to an active antenna SMA
GPS second pulse signal pps one second, its role is used to indicate the time of the whole second, and the moment is usually marked with the rising edge of the PPS pulse. Because GPS can give UTC time, but the user will receive a time delay, then in order to fine timing, the introduction of the rising edge of the PPS signal to mark UTC the whole second moment, the accuracy can be nanoseconds, and there is no cumulative error.