Can you swim in the sea with a smartwatch?

Almost all modern smartwatches have some form of water resistance. But that doesn't mean you can safely wear them in the sea. In practice, seawater and active swimming often lead to device failure.

What protection standards exist

Two main standards are used to indicate water resistance:

• IP (Ingress Protection) — the most common. For example, IPX7 means the device can withstand brief immersion to a depth of up to 1 meter, while IPX8 allows for deeper and longer immersion.
• WR / ATM — a more intuitive system for watches. WR50 or 5 ATM means the watch can withstand pressure at depths of up to 50 meters, WR100 or 10 ATM — up to 100 meters.

However, all of these standards are primarily designed for fresh water.

Why seawater is more dangerous than a pool

Seawater contains salt, which acts as an aggressive corrosive agent:

• Salt eats away at contacts, the speaker, microphone, and metal parts.
• Salt crystals can get under buttons and seals, compromising watertightness.

Additionally, during swimming and diving, the watch is subjected to extra pressure from waves and arm movements. Heating the watch body in the sun can also degrade the properties of the sealing gaskets.

Static and dynamic are different things

Manufacturers often specify maximum depth under static conditions. Swimming, jumping into the water, and active movement significantly increase the actual load. Therefore, even watches rated at 5 ATM do not always withstand seawater and active swimming.

Important recommendations

• After swimming in the sea, be sure to rinse the watch in fresh water.
• Do not leave the device wet — dry it thoroughly.
• Even if the watch is advertised as waterproof, it is better to take it off before swimming in the sea.

Warranty won't help

If water does get inside, service centers most often refuse warranty repairs. Proving that you did not exceed the allowable depth is practically impossible. After repair, water resistance is often compromised.

In brief

Most smartwatches have water protection designed for fresh water. Seawater with salt is significantly more aggressive and can cause corrosion. Active swimming and diving create additional pressure. Even with high stated protection (IP68, 5–10 ATM), swimming in the sea remains risky. After contact with seawater, the watch must be rinsed in fresh water and dried thoroughly. The safest approach is to take your smartwatch off before swimming in the sea.