Cal. No. F990
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Particular settings for satellite controlled watches
Information on rollover number setting
In order for this watch to correctly process the week information (week number) received from the satellite, a rollover number for each time period is set.
Rollover number setting is updated automatically.
If the rollover number setting is incorrect, the time and date may not be indicated accurately.
Check the rollover number setting and adjust it if it is incorrect.
Table of rollover number and time period
| Time period (Coordinated Universal Time, GMT) | Rollover number |
|---|---|
| 22/8/1999 (Sun) 0:00 – | 0 |
| 7/4/2019 (Sun) 0:00 – | 1 |
| 21/11/2038 (Sun) 0:00 – | 2 |
| 7/7/2058 (Sun) 0:00 – | 3 |
| 20/2/2078 (Sun) 0:00 – | 4 |
| 6/10/2097 (Sun) 0:00 – 22/5/2117 (Sat) 23:59 | 5 |
In the time information send from GPS satellites, 1024 weeks (about 20 years) are gathered into a group and each of the groups is assigned a unique number.
The number of the group is called a “rollover number”.
Every week of a group is numbered from 0 to 1023 and the numbers are called “week numbers”.