Sheutsyk, How did we at Leica Geosystems prepare for the week rollover? The week rollover has been simulated using a GPS signal generator. Tests have been done with Leica Geosystems GNSS receivers introduced since 2004. This includes the System 1200, GPS900, GS/GR/GM/GG product families. The latest firmware versions were installed in all tested receivers. Based on the performed tests, we do not expect that the GPS week rollover will cause any issues regarding signal tracking, positioning or observation data logging. What do our users have to do to avoid problems with this issue? No customer action is required, as all currently operational Leica Geosystems GNSS receivers will not be affected by this week rollover. Nevertheless, to ensure the best possible performance, it is a good practise to use the latest firmware. Additional information Older firmware versions of the tested receivers have not been considered but we expect no difference. GPS500 has been tested as well and we do not expect any issues. However, in the unlikely case of issues no firmware update will be provided (the phase-out of GPS500 has happened in 2004) В общем не волнуйтесь, все в порядке.