Just bought this gw-3000m-4aer. I set the correct time zone, yet it's 1 or 2 minutes ahead. Tried to let it receive the correct time over night, tried manual receive, didn't work.
Casio Gravitymaster GW-3000M-4AER | Helveti.eu
User manual Casio G-Shock GW-3000M-4AER (English - 6 pages)