GPS gprs module of high Performance, Low Price 1.Chipset:SiRF ... . 3.Size:20.0*28.0*3.2 mm GPS gprs module with Low Price, High Performance, International Approvals, Prompt ... SiRF binary:position, velocity, altitude, status output11.TIMEMARK-1PPS Pulse: 1).Level TTL 2).Pulse duration 1us 3).Time reference At the ... pulse positive edge 4).Measurements Aligned to GPS second, ±1 ...