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System ECDIS-E User Guide
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The following table lists all data states and a description.
Data State Description
Dead Reckoned
A long period of time has passed since an actual
measurement of the data was received. Since that time, the
data has been adjusted to make it correct for the current
time. However, this adjustment (performed using a dead
reckoning or estimation algorithm) may not be very
accurate. When data is dead-reckoned, it is considered
usable, but degraded.
Implausible
The data is not within reasonable limits or it is changing at
an unreasonable rate. When this applies, the data is
considered unusable.
Inaccurate
There is a possibility that the data is not accurate, based on
some of the information being supplied by the sensor. For
example, if position data is supplied in a datum other than
WGS84, and the sensor does not supply the offset needed
to adjust it to WGS84, the data will be considered
inaccurate. When this applies, the data is considered
usable, but degraded.
Invalid
The sensor providing the data is indicating that the data is
not valid.. When this applies, the data is considered
unusable.
Manual
The data was manually entered. When this applies, the data
is considered usable, but degraded.
Nearly Valid
The source of this data is indicating "Invalid" for some of the
samples it is providing. If a higher percentage of samples
are received with the "invalid" indication, then the data may
be indicated as absolutely invalid, in which case it will be
considered unusable. When "Nearly Invalid", data is
considered usable, but degraded.
Nearly
Unavailable
The system has received fewer than the expected number
of samples over a recent timespan. If even fewer samples
are received, the data may become "Unavailable", in which
case it will be considered unusable. When "Nearly
Unavailable", data is considered usable, but degraded.
Over the FOM
Limit
Position sensors can be configured for a maximum figure of
merit. If a position sensor indicates that its position data has
a figure of merit greater than the configured maximum figure
of merit, then the system will indicate that the data is "over
the FOM limit", which results in the data being considered
degraded.