R5
SUPREME - Navigation System
OPERATION FUNCTIONALLITIES
7000 118-383, P11A1
Page 70
Figure 66
– Tide Table
8.2.3.5 Units of Predicted Tide
Predicted tide can be displayed in meters, feet or fathom units as defined by the ‘Depth Unit’
configuration parameter. This parameter is accessed from the
Units Configuration
view
described in section 10.1.12.
8.2.3.6 Treatment of Local Time Zones
For each port, a ‘Zone’ parameter shall be entered as defined in ATT part III. This parameter
defines the relationship of data published in ATT with respect to UTC.
When a tide prediction is generated, a graph will be displayed for 00 to 24 hours of a selected
date. This time will be in UTC or with any user selectable local time offset as defined in the
Time Zone Settings
view (see section 10.1.11
). If UTC is used, times will be denoted ‘UTC’.
If a local time frame is used, times will be denoted ‘LOC’. This is in analogy with how all times
generally are treated by the R5 SUPREME CDU.
Thus, it is important to realize that a tide displayed in ‘LOC’ time is not necessarily the local
time in the port (defined by the ‘Zone’ parameter). If this is desired, the user must manually
define the local time in the
Time Zone Settings
view that corresponds to the ‘Zone’ value for
the actual port.
To make things mo
re complicated, the ‘Zone’ parameter in ATT part III is defined as (UTC
time
– Local Time) and thus being negative when moving eastwards from Greenwich. On the
other hand, the local time offset in the
Time Zone Settings
view is to be added to UTC and
there
fore positive when moving eastwards. Thus, a negative ‘Zone’ value is equivalent to a
positive offset of time configuration and vice versa.
In general: always enter ‘Zone’ for the port as indicated in ATT part III and select local time
offset in
Time Zone Settings
view to obtain the desired local time frame for which the
prediction is to be obtained.
Examples of ‘Zone’ setting and corresponding local time configuration are shown in the
following two figures. Notice that the Zone setting for the port in this example is -01.00 hours
as indicated by ATT part III while the corresponding local time configuration in the
Time
Config
view is +01.00 hours. This will ensure that predictions in the
Tidal Plot
view are
calculated and shown in the ports local time.
