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.1.1 be capable of receiving and processing the
Standard Positioning Service (SPS) signals of the GPS as modified
by Selective Availability (SA) and range code signals in GLONASS and
provide position information in latitude and longitude World Geodetic
System (WGS) 84 co-ordinates in degrees, minutes and thousandths of
minutes. Means may be provided to transform the computed position
into data compatible with the datum of the navigational chart in use.
Where this facility exists, the display and any data output should
indicate that the co-ordinate conversation is being performed and
should identify the co-ordinate system in which the position is expressed;
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.1.2 operate on the L1 frequency signal and C/A
code in GPS and L1 frequency signal and range code in GLONASS;
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.1.3 be provided with at least one output from
which position information can be supplied to other equipment. The
output of position information should be in accordance with the relevant
international standard;footnote
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.1.4 have static accuracy such that the position
of the antenna is determined to within 35 m (95%) in non-differential
mode and 10 m (95%) in differential mode with horizontal dilution
of precision (HDOP) ≤ 4 or position dilution of precision (PDOP)
≤ 6;
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.1.5 have dynamic accuracy such that the position
of the ship is determined to within 35 m (95%) in non-differential
mode and 10 m (95%) in differential mode with HDOP ≤ 4 or PDOP
≤ 6 under the conditions of sea states and ship's motion likely
to be experienced in shipsfootnote;
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.1.6 be capable of selecting automatically the
appropriate satellite transmitted signals for determination of the
ship's position with the required accuracy and update rate;
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.1.7 be capable of acquiring satellite signals
with input signals having carrier levels in the range of -130 dBm
to -120 dBm. Once the satellite signals have been acquired the equipment
should continue to operate satisfactorily with satellite signals having
carrier levels down to -133 dBm;
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.1.8 be capable of acquiring position to the required
accuracy, within 30 min, when there is no valid almanac data;
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.1.9 be capable of acquiring position to the required
accuracy, within 5 min, when there is valid almanac data;
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.1.10 be capable of re-acquiring position to the
required accuracy, within 5 min, when all GPS and GLONASS signals
are interrupted for a period of at least 24 h, but there is no loss
of power;
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.1.11 be capable of re-acquiring position to the
required accuracy, within 2 min, when subjected to a power interruption
of 60 s;
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.1.12 be capable of re-acquiring an individual
satellite signal and utilizing it in the position solution within
10 s after being blocked for 30 s;
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.1.13 generate and output a new position solution
at least once every 1 s;
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.1.14 have a minimum resolution of position, i.e.
latitude and longitude of 0.001 min; and
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.1.15 have the facilities to process DGPS and
DGLONASS data fed to it, in accordance with Recommendation ITU-R M.823
and the appropriate RTCM standard.