 |
|
To All Customers:
We greatly appreciate your use of our products.
This is to inform you of the “GPS week number rollover” problem and how it affects our GPS Navigator / Sensor.
The GPS system calculates time by counting the number of weeks up to a maximum of 1,023 weeks. After week 1,023, the week number count is reset to zero. This is called “GPS week number rollover”.
The GPS week number rollover occurs every 1,024 weeks - about once every 19.6 years. Therefore, when 19.6 years has passed from the reference date in the systems, the clock time incorporated in GPS sensors and navigators will be reset, causing as a result errors in display or output of date, or unstable occurrence in positioning operation.
When GPS week number rollover occurs, our GPS Navigator / Sensor may cause the following problems:
| 1. |
Date displayed dates back to 19.6 years ago. |
| 2. |
All dated data output by equipment date back to 19.6 years
ago. |
| 3. |
Due to this inaccurate date, positioning operation may temporarily
become unstable or be interrupted. |
When this rollover has occurred, please switch on the equipment twice to recover the normal positioning operation. After recovery of the operation, the date will remain as it is in 19.6 years ago, but time and positioning operation will function normally.
We regret any inconvenience this may cause you, but appreciate your kind understanding in this matter.
Sincerely yours, |
|
|
|
Affected GPS Navigator / Sensor and Countermeasures
| ● |
When the dated data displayed on equipment and the dated data output from equipment
are not used, there would be no need to take countermeasures. When data is continued
to be used, either one of the following countermeasures shall be taken:
|
| 1. |
Upgrade of software version. |
| 2. |
Replacement of equipment (When equipment can not be dealt
with by upgrade of software version). |
|
Please refer to the tables below for countermeasures for each type of equipment.
It is possible to postpone the occurrence of rollover to the year of 2028 by
upgrading of software, but it may not be possible to upgrade software, even if
charge is paid, as the needed ROM software may not be available on all models.
In such cases, replacement of equipment will be provided with charge. Please contact
our distributors / dealers where you have purchased or our marine sales department
for details on the equipment subject “upgrading of software version”.
We appreciate your kind understanding that the cost shall be born by you for either
case of the countermeasure above mentioned.
| ● |
In the tables below, only equipment expected to have this
rollover in years of 2010, 2012 and 2013 are listed. Equipment not listed can
be expected to have this rollover in the year of 2018 or later and therefore they
are not listed at this time. |
| ● |
Even on the same equipment models, this phenomenon may occur
on a different date, due to its software number and version number. The tables
below list the earliest possible date of occurrences. |
|
|
| Table 1 - GPS Sensors |
|
|
Date of
rollover occurrence |
Model Name |
Countermeasures |
| August 15, 2010 |
GPS-4A |
Unit replacement is necessary |
August 15, 2010
|
GPS-5 |
Unit replacement is necessary |
| February 5, 2012 |
GPS-4Amk2 |
Unit replacement is necessary |
| February 5, 2012 |
GPS-6 |
Unit replacement is necessary |
January 20, 2013
|
GPS-10 |
Unit replacement is necessary |
| January 20, 2013 |
GPS-10A |
Unit replacement is necessary |
| January 20, 2013 |
KBG-1 |
Unit replacement is necessary |
| January 20, 2013 |
KBG-2/DGPS-11 |
Unit replacement is necessary |
|
|
|
|
| Table 2 - GPS Navigators |
|
|
Date of
rollover occurrence |
Model Name |
Countermeasures |
| August 15, 2010 |
KGP-95/GPS-7 |
Unit replacement is necessary |
August 15, 2010
|
KGP-97/GPS-8 |
Unit replacement is necessary |
| August 15, 2010 |
KGP-910/910A
GPS-77P |
Unit replacement is necessary |
| August 15, 2010 |
KGP-911/GPS-88P |
Unit replacement is necessary |
| August 15, 2010 |
KGP-930 |
Unit replacement is necessary |
| February 5, 2012 |
KGP-98/98D
GPS-9/9D |
Unit replacement is necessary |
| February 5, 2012 |
KGP-931 |
Unit replacement is necessary |
| January 20, 2013 |
KGP-9/HG-7 |
Unit replacement is necessary |
| January 20, 2013 |
KGP-912/GPS-99P |
Serial No.91208112 and before:
Unit replacement is necessary
Serial No 91208113 and after: Upgrading of software |
| January 20, 2013 |
KGP-913/913D
GPS-90/90D |
Upgrading of software |
| January 20, 2013 |
KGP-931D |
Serial No.93101280 and before:
Unit replacement is necessary
Serial No.93101281 and after: Upgrading of software |
|
|
|
|
| Table 3 - Chart Plotters |
|
|
Date of
rollover occurrence |
Model Name |
Countermeasures |
| August 15, 2010 |
KGF-960 |
Unit replacement is necessary |
| August 15, 2010 |
GTD-07 |
Switch on the power supply twice |
| August 15, 2010 |
GTD-2000 |
Unit replacement is necessary |
| August 15, 2010 |
GTD-2020 |
Switch on the power supply twice |
| August 15, 2010 |
GTD-210 |
Unit replacement is necessary |
| August 15, 2010 |
GTD-2200/2200X |
Switch on the power supply twice |
| August 15, 2010 |
GTD-2210 |
Switch on the power supply twice |
| August 15, 2010 |
GTD-2400 |
Switch on the power supply twice |
| August 15, 2010 |
GTD-2410 |
Switch on the power supply twice |
| February 5, 2012 |
GTD-1100 |
Unit replacement is necessary |
| February 5, 2012 |
GTD-2010 |
Switch on the power supply twice |
| January 20, 2013 |
GTD-1200 |
Unit replacement is necessary |
|
|
|
|
|
