Hardware manual

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990-0000058-1000 Rev F Page 31
Table 4-11 Heading-Deviation & Variation
ARGUMENT DESCRIPTION
x.x Depth, meters
x.x Offset from transducer,
- positive means distance from tansducer to water line
- negative means distance from transducer to keel
ZDA - Time & Date
UTC, day, month, year, and local time zone
$--ZDA,hhmmss.ss,dd.mm,yyyy,ll,zz*hh<CR><LF>
Table 4-12 ZDA-Time and Date
ARGUMENT
DESCRIPTION
hhmmss.ss Universal Time Coordinated (UTC). Hours|Minutes|Seconds.decimal
- 2 fixed digits of hours, 2 fixed digits of minutes, 2 fixed digits of
seconds and a variable number of digits for decimal fractions of
seconds. Always pad with leading zeros.
dd.mm Day(01 to 31)|.Month(01 to 12)
yyyy Year
ll
Local zone description, 00 to
±
13 hour. This field is optional and
ignored.
zz Local zone minutes description, same sign as local hours This field is
optional and ignored.
NOTES:
Zone description is the number of whole hours added to local time to obtain GMT,
Zone description is negative for East longitudes.
The GLL string provides a more accurate time reference since it is related to the
position fix.
Time and date from the computer CPU are also recorded and could be displayed if
GPS time and date are not available.
Fix marks are bars across the time zero line in all channels.