Omega Seamaster Aqua Terra GMT Cal.8605 TPD & Winder Settings | Aevitas

A Omega Seamaster Aqua Terra GMT Cal.8605 (Calibre 8605) that sits unworn will run its power reserve down within days. Set a winder to 650 turns per day, rotating in both directions, and it stays wound without any fuss.

Recommended Winder Settings

Setting	Value
Turns per day (TPD)	650
Winding direction	bidirectional
Movement	Calibre 8605

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Why These Settings Matter

Every automatic movement is designed to receive a certain amount of winding each day. Give the Seamaster Aqua Terra GMT Cal.8605 its 650 turns and the mainspring stays in the middle of its power band, where timekeeping is most consistent. Drop well below that figure and the watch gradually runs down; the date and time then need resetting by hand.

There is no need to worry about going over the top: like all modern automatics, this movement has a slipping mainspring bridle that lets the barrel slip once it is fully wound, so extra turns cannot overwind or damage it. A higher setting simply means the winder cycles a little more often than strictly necessary.

Because all Aevitas winders offer settings from 650 to 1,850 TPD, you can programme exactly 650 TPD for this watch — and reprogramme in moments if you swap watches around.

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