We would like to inform valued customers and users of FURUNO GPS marine products of the GPS week number rollover occurring on 20th June 2021.
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 June 2021
List of Affected Equipment
| MODEL | SERIAL NUMBER | MODEL | SERIAL NUMBER |
| GP-3500F | Before 3484-0893 | GP-1650W | Before 3474-3690 and
3474-3706 to 3473-3733 |
| GP-80 | All serial number | GP-1650WD | Before 3476-6430 |
| GP-90 | Before 4400-6461 | GP-1650WF | Before 3475-0200 |
| GP-1640 | Before 3458-0700 | GP-1650WDF | Before 3477-0254 |
| GP-1640F | Before 3459-0950 | GP-1850W | Before 3478-1813 |
| GP-320B | Before 3473-6767 | GP-1850WF | Before 3480-2745 |
| GP-32 | Before 4439-1803 | GP-1850WD | Before 3479-0594 |
| GP-37 (GP-37-J) | Before 4441-3005 | GP-1850WDF | Before 3481-1225 |
Recommendation
Contact us for more information:
For Retrofits: salesgrp@furuno.sg
For Software Upgrade: sdc@furuno.sg
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