We would like to inform valued customers and users of FURUNO GPS marine products of the GPS week number rollover occurring on 20th December 2020.
This happens because the GPS system calculates time by counting to 1023 weeks, after which, the count resets to zero. This is called the “GPS Week Number Rollover”. Subsequent erroneous data information on the GPS receiver clock may result in position instability, causing position errors, including failure of the GPS position acquisition etc.
Rollover Occurrence Date: 20th December 2020
List of Affected Equipment
| MODEL | REMARKS |
|
FELCOM15 S/N before 3533-9370 FELCOM16 S/N before 3534-2755 |
Rollover will not affect communication function, but the following my occur:
|
| FELCOM70 | Rollover will not affect communication function, but the dates on communication logs will be incorrect.
Note: The service of Inmarsat F will terminate on 30th Nov 2020. |
| FA-100/R | Rollover will not affect communication function, but it will affect the dates of the AIS internal system (internal GPS, display of own ship dynamic data, logs transmitted, messages received, alarm logs and power on/off logs). |
|
GP-310B S/N before 3453-5687 |
No calculation of the position occurs. |
Recommendations
FELCOM15/16
(i) Flowchart to check if software upgrade is necessary
(ii) How to check GPS Port
Contact us for more information:
For Retrofits: salesgrp@furuno.sg
For Software Upgrade: sdc@furuno.sg
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