Moreover, Marathon timepieces are now standard issues for the U.S. Army, Navy, Marine Corps, NASA, and Canadian Armed Forces as well as law enforcement and government agencies worldwide. Marathon watches are also known for their tritium gas tubes to ensure optimal legibility in the dark environment.

The ETA F06 is accurate to -0.3/+0.5 seconds per day and includes an End of Life (EOL) indicator that will advance the seconds hand once every 4 seconds to inform you that a battery change is needed. The GPQ uses a sapphire crystal which is durable and scratch resistant.

As far as the original question, I believe the Navigators are water resistant to 100 meters. That being said, I have swam with mine (watch gurus would--most likely--cringe at the thought). Showers, definitely have had no problem.

Marathon Watch Company Ltd. is a Canadian watch manufacturer founded in 1939.