... Almanac data: The almanac parameters provided in subframes and ˙ are: es , t oa , Q , as , Q e , q, M , af , and af The almanac data are much less accurate than the detailed ephemeris data of ... indication of the transmitting satellite The MSB (bit 77) indicates a summary of the health of the navigation data, where bit 77 equals: All navigation data are OK Some or all navigation data are bad ... second row shows a navigation data bit that has a data rate of 50 Hz; thus, a data bit is 20 ms long and contains 20 C/ A codes Thirty data bits make a word that is 600 ms long as shown in the...