5.1 The equipment should provide an indication if the
position calculated is likely to be outside of the requirements of these performance
standards.
5.2 The combined GPS/GLONASS
receiver equipment should provide as a minimum:
.1 an indication within
5 s if either:
.1.1 the specified HDOP has been
exceeded; or
.1.2 a new position has not
been calculated for more than 1 s.
Under such conditions the last
known position and the time of the last valid fix, with explicit indication of this
state, so that no ambiguity can exist, should be output until normal operation is
resumed;
.2 a warning of loss of
position;
.3 DGPS and DGLONASS status
indication of:
.3.1 the receipt of DGPS and DGLONASS
signals; and
.3.2 whether DGPS and
DGLONASS corrections are being applied to the indicated ship's position;
.4 DGPS and DGLONASS integrity status and alarm; and
.5 DGPS and DGLONASS text message
display.