How to use

F990

Particular settings for satellite controlled watches

Information on leap second setting

This watch displays the time by applying the leap second to the International Atomic Time information received from satellites.
The leap second may be applied once a few years and the leap second setting on the watch is automatically adjusted when it is applied.

Check and adjust the leap second setting manually following “Checking and adjusting the leap second setting manually” when it is not adjusted automatically.

You can find a list of leap seconds at the homepage of IERS (INTERNATIONAL EARTH ROTATION & REFERENCE SYSTEMS SERVICE).