Casio 3069 Manual page 114

Recover indicator
• Even if battery power is at Level 1 or Level 2, the Digital Compass Mode,
Barometer/Thermometer Mode, or Altimeter Mode sensor may be disabled
if there is not enough voltage available to power it sufficiently. This is
indicated by R (recover) on the display.
• If R (recover) appears frequently, it probably means that remaining battery
power is low. Leave the watch in bright light to allow it to charge.
E-112
• Performing multiple sensor, illumination, or
beeper operations during a short period may
cause R (recover) to appear on the display.
Illumination, alarm, countdown timer alarm,
hourly time signal, and sensor operations will
be disabled until battery power recovers.
After some time, battery power will recover and
R (recover) will disappear, indicating that the
above functions are enabled again.