Garmin GPS 25 LP Technical Specification

Garmin GPS 25 LP Technical Specification Manual pdf 26 page image

22and time of day for leap second correction follow the guidelines in “National Institute ofStandards and Technology Special Publication 432 (Revised 1990)” (for sale by theSuperintendent of Documents, U.S. Government Printing Office, Washington, D.C.,20402, U.S.A.).When a positive leap second is required, the second is inserted beginning at 23h 59m60s of the last day of a month and ending at 0h 0m 0s of the first day of the followingmonth. The minute containing the leap second is 61 seconds long. The GPS 25LPwould have transmitted this information for the leap second added December 31, 1989as follows:Date Time311289 235959311289 235960010190 000000If a negative leap second should be required, one second will be deleted at the end ofsome UTC month. The minute containing the leap second will be only 59 secondslong. In this case, the GPS 25LP will not transmit the time of day 23h 59m 59s for theday from which the leap second is removed.4.2.3 Global Positioning System Almanac Data (ALM)$GPALM,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>,<13>,<14>,<15>*hhAlmanac sentences are not normally transmitted. Almanac transmission can beinitiated by sending the sensor board a $PGRMO,GPALM,1 command. Upon receipt ofthis command the sensor board will transmit available almanac information on GPALMsentences. During the transmission of almanac sentences other NMEA data output willbe temporarily suspended. can be found in section 4.1.1.4.2.4 Global Positioning System Fix Data (GGA)$GPGGA,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,M,<10>,M,<11>,<12>*hh<1> UTC time of position fix, hhmmss format<2> Latitude, ddmm.mmmm format (leading zeros will be transmitted)<3> Latitude hemisphere, N or S<4> Longitude, dddmm.mmmm format (leading zeros will be transmitted)<5> Longitude hemisphere, E or W