Figure 36: Boreas Web UI Heave Page
9.1.2.12 Coarse Heading Alignment
Coarse Alignment is used to derive the heading based on a gyrocompass' estimation of true North. For more
information, see
. Coarse alignment is necessary to establish an approximate heading
when a dual antenna GNSS heading or alternate source is unavailable, such as in a GNSS denied environment.
Once coarse alignment is complete, a heading is established, after which the gyrocompass will be used for fine
alignment.
The Coarse Heading Alignment page displays the current status of the initialisation process. Given below is a list
statuses and warnings that may be displayed during this process:
Status Mes-
sages
Description
Awaiting pos-
ition via GNSS
or manual ini-
tialisation
An approximate position is required to complete coarse alignment. Initialisation will com-
mence as soon as the position is available. If GNSS positioning is not available, provide
the position details manually on the
page.
Initialising,
please wait
With the position known, the process of determining the coarse heading alignment has
commenced. This process will take 2 minutes, unless it is restarted due to excessive
motion or a significant change in latitude.
Alignment ini-
tialised via altern-
ate source
Coarse alignment is not required as heading has been initialised via an alternate source,
such as
,
or
. If heading is available from one of
these sources, coarse alignment is not required.
Heading coarse
alignment com-
plete
The system has successfully determined an approximate heading.
Table 24: Coarse Heading Alignment - Status Messages
Warning Messages
Description
Initialisation restarted - excess-
ive motion detected
Initialisation has been automatically restarted due to excessive motion.
v1.2
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11 Oct 2022
Boreas Reference Manual • Configuring and Monitoring Boreas