... power consumption * Small size * Easy integrated GPS engine The GR-87 design utilizes the latest surface mount technology (BGA) and high ... . Frequency L1, 1575. 42 MHz. 2. C/A code 1.023 MHz chip rate. 3. Channels: 20.TIMEMARK-1PPS Pulse 1 ... . SiRF binary-position, velocity, altitude, status output. GPS module GR-87