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4.2.2

Transmitted Time

The GPS sensor outputs Coordinated Universal Time (UTC) date and time of day in the transmitted sentences.

Before the initial position fix, the on-board clock provides the date and time of day. After the initial position fix, the

date and time of day are calculated using GPS satellite information and are synchronized with the measurement

pulse output.

The GPS sensor uses information obtained from the GPS satellites to add or delete UTC leap seconds and correct the

transmitted date and time of day. The transmitted date and time of day for leap second correction follow the

guidelines in "National Institute of Standards and Technology Special Publication 432 (Revised 1990)" (for sale by

the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C., 20402, U.S.A.).

When a positive leap second is required, one second is inserted at the beginning of the first hour (0h 0m 0s) of the

day that the positive leap is occurring. The minute containing the leap second is 61 seconds long. The GPS sensor

would have transmitted this information for the leap second added December 31, 1998 as follows:

$GPRMC,235959,A,3851.3651,N,09447.9382,W,000.0,221.9,071103,003.3,E*69

$GPRMC,000000,A,3851.3651,N,09447.9382,W,000.0,221.9,081103,003.3,E*67

$GPRMC,000001,A,3851.3651,N,09447.9382,W,000.0,221.9,081103,003.3,E*66

If a negative leap second should be required, one second will be deleted at the end of some UTC month. The minute

containing the leap second will be only 59 seconds long. In this case, the GPS sensor will not transmit the time of

day 0h 0m 0s (the "zero" second) for the day from which the leap second is removed.

$GPRMC,235959,A,3851.3650,N,09447.9373,W,000.0,000.0,111103,003.3,E*69

$GPRMC,000001,A,3851.3650,N,09447.9373,W,000.0,000.0,121103,003.3,E*6A

$GPRMC,000002,A,3851.3650,N,09447.9373,W,000.0,000.0,121103,003.3,E*69

4.2.3

Global Positioning System Almanac Data (GPALM)

Almanac sentences are not normally transmitted. Send the GPS sensor the sentence "$PGRMO,GPALM,1" to

initiate almanac transmission. Upon receipt, the GPS sensor will transmit available almanac information on GPALM

sentences. During the transmission of almanac sentences, other NMEA 0183 data output is suspended temporarily.

$GPALM,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>,<13>,<14>,<15>*hh<CR><LF>

<field information> can be found in section

190-00885-07

4.1.1 Almanac Information

GPS 17x HVS Technical Specifications

Page 13

(GPALM).

Rev. A