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12 June 2018

Notice: GPS Week Number Rollover for equipment

Dear Customers,

We would like to announce that GPS week number rollover for equipment is to occur on some of our GPS' on 4th August 2019.

The subject models are designed to turn the clock back 19.6 years (December 19, 1999), and will continue to work incorrectly under normal use, however there is no influence on positioning operation.
As the results, the following abnormalities occur in some equipment.
- The some date information will be displayed erroneous.
- The erroneous date will be output to external equipment.

For details, please see the 2. notice and countermeasures below.

*: The week number counter in GPS resets once every 1023 weeks, which is approximately 19.6 years. The week number counters for the GPS in the discontinued models below started their week count from the 19 December 1999. It is on the 4th August 2019 at 00:00 AM (UTC) that the week number counters rollover will occur.

1.Objective Equipment

AIS(JHS-180/182)

Inmarsat C(JUE-75A/75C)

GPS navigator(JLR-7700MKⅡ)

GPS receiver(JLR-4330/4330W/4331/4331W)

GPS compass(JLR-10/10T)


2.Notice and Countermeasures

The rollover day is on the 4th August 2019 at 00:00 AM (UTC).

Equipment Models Subject Serial No. Notice Countermeasures
AIS JHS-180 All Some log date information will
be displayed erroneous. The
erroneous date will be output
to Aux port.
Replace with JHS-183
JHS-182 Up to BB51400*1 Replace with JHS-183
or
Upgrade the software*5
Inmarsat C JUE-75A/C JUE-75 with optional
GPS kit (6EZSC00031)
Some function of scheduled
calling and position reporting
will operate erroneous.
Connect the external GPS
or
replace with JUE-87
GPS Navigator JLR-7700MKⅡ Refer JLR-4331 Note that time and date will go back to the starting date (December 19, 1999) when a master-reset of equipment or a battery replacement is carried out after rollover day. When the time and date
go back to the staring date,
the equipment will return
to normal operation by the
following settings.

Setting method of
JLR-7700MkⅡ

Setting method of
JLR-4330,JLR-4330W,
JLR-4331,JLR-4331W

Setting method of
JLR-10,JLR-10T

GPS Receiver JLR-4330 Up to KE54238*2
JLR-4330W All
JLR-4331 Up to KE50478*3
JLR-4331W Up to KE51718*4
GPS Compass JLR-10/10T ALL

*1: Next rollover of BB51401 and after will be August 2025. Notice and countermeasures are same as this.
*2: Next rollover of KE54239 and after will be May 2022. Notice and countermeasures are same as this.
*3: Next rollover of KE50479 and after will be May 2022. Notice and countermeasures are same as this.
*4: Next rollover of KE51719 and after will be May 2022. Notice and countermeasures are same as this.
*5:
 For more information, and countermeasures, please contact our service agents or sales representatives.
 For the software update, the corresponding cost will be charged.
 It is possible to support in August 2025 with this software to be released.

For further information : please contact

Japan Radio Co., Ltd.

Marine Business Department
TEL: 03-6832-1807