Precise GPS Time

TM 11-5820-890-10-8

4.4b.

Precise GPS Time

IMPORTANCE

As with the two-digit Julian Date, the importance of having the same

accurate sync time in all FH radios is for cross-net communications. If

only one net is involved, any time will do. If you want to communicate

with nets you do not have loaded in your radio, having the same sync

time is a big advantage.

SOURCE

Global Positioning System (GPS) satellites offer SINCGARS users very

precise time by use of the Precision Lightweight GPS Receiver (PLGR).

COMMON BASE

When all FH nets are opened using precise GPS time, and when sync

time of the NCS radio is checked against GPS time daily, all nets within

a division or larger force are accessible by merely changing to the

proper net ID.

NO EXCEPTIONS

With GPS time readily available to all SINCGARS NCSs and operators,

there is no reason to use other than GPS time for SINCGARS sync time.

4.4c.

Common Zulu Time

IMPORTANCE

Zulu time is commonly used for military message dating to provide a

common basis of time around the world. Zulu time is used as basic

SINCGARS sync time to ensure that all nets are using the same time,

especially important when operating near a time zone boundary.

The PLGR provides both local and Zulu time; either may be selected

AVAILABILITY

and read or transferred directly from the device.

Appendix A to this manual provides a time zone map with Zulu time

highlighted. For example, when Zulu time is 2400 hours, local time in

New York is 1900, and in California it is 1600.

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