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Yet you will still void the warranty if you dive with it: Apple Watch Ultra has a water resistance rating of 100 meters under ISO standard 22810. Apple Watch

Yet you will still void the warranty if you dive with it: Apple Watch Ultra has a water resistance rating of 100 meters under ISO standard 22810. Apple Watch Ultra may be used for recreational scuba diving (with a compatible third-party app from the App Store) to 40 meters, and for high-speed water sports. Apple Watch Ultra should not be used for diving below 40 meters. Water resistance is not a permanent condition and can diminish over time. For additional information, see support.apple.com/en-us/HT205000.

jitl 4y ago
What do you mean? It’s rated to 100m, which is quite a bit below the 40m limit for most recreational diving.
- teddyh 4y ago
  “Rated to 100m” does not mean what you think it means. It means, essentially, that it theoretically would be safe at 100m depth, assuming you lower it slowly and don’t move it about at all. IIUC, local water pressure varies significantly when you move something around underwater, which is why “100m pressure proof” does not mean “can be brought down to 100m depth”.
  - JohnBooty 4y ago
    IIUC, local water pressure varies significantly when you move something around underwater If Wikipedia can be trusted here, movement doesn't increase water pressure as much as we think: https://en.wikipedia.org/wiki/Diving_watch#Water_resistance https://en.wikipedia.org/wiki/Diving_watch#Water_resistance Movement induced dynamic pressure increase is sometimes the subject of urban myths and marketing arguments for diver's watches with high water resistance ratings. When a diver makes a fast swimming movement of 10m/s (32.8ft/s) (the best competitive swimmers and finswimmers can not swim nearly that fast) physics dictates that the diver generates a dynamic pressure of 0.5 bars (50kPa) or the equivalent of 5 meters of additional water depth. One other thing stands out to me... It means, essentially, that it theoretically would be safe at 100m depth It's interesting (alarming?) that they chose the "weaker" ISO standard 22810 for water resistance, in which a sampling of units are tested: https://en.wikipedia.org/wiki/Water_Resistant_mark https://en.wikipedia.org/wiki/Water_Resistant_mark ISO 6425 is much more stringent and specifies that every single unit is pressure tested to 125% of rated capability, ie a 200M ISO 6425 watch has been individually tested at 250M for a period of time.
    - jitl 4y ago
      ISO 6425 is generally used for dive watch, eg a Rolex Submariner, not dive computer. I don't know any dive masters who wear a dive watch while diving; they seem like mostly a fashion / status symbol kind of thing? I have no interest in them anyways. I looked at the Garmin spec sheets before buying my Apple Watch and didn't find any of their computer/watch combos listing ISO 6425. Instead they list a depth (usually 100M) and attest "Tested to engineering standard EN13319 for dive compliance", see https://www.garmin.com/en-US/legal/waterrating-definitions/ https://www.garmin.com/en-US/legal/waterrating-definitions/
      - JohnBooty 4y ago
        My understanding is that before the advent of dive computers, dive watches were used for diving so that you could time your ascents and so forth. That's what lead to the development of the (quite strict) ISO 6425 standard. they seem like mostly a fashion / status symbol kind of thing Yeah, this is my understanding from talking to diver friends. As a guy who likes watches yes, they're crazy popular in the watch community. They've become kind of a genre unto themselves. Citizen, Seiko, and others make affordable ISO 6425 models. I own a few, didn't pay more than $150 for any of them. Though, I dunno about the "status symbol" aspect. For $30 you can get a diver-style watch that looks like an actual ISO 6425 watch unless you know specifically what you're looking for. So I don't think anybody would be impressed by them. But they are fun to own and rather handsome, if you like that kind of thing.
    - teddyh 4y ago
      > If Wikipedia can be trusted here, movement doesn't increase water pressure as much as we think: https://en.wikipedia.org/wiki/Diving_watch#Water_resistance https://en.wikipedia.org/wiki/Diving_watch#Water_resistance I stand corrected, but the same article also states: “Water Resistant 100 m […] NOT suitable for diving.” “Water Resistant 200 m [.] Suitable for skin diving only. NOT suitable for scuba diving.” And, IIUC, WR100 is exactly what the Apple Watch Ultra has.
      - JohnBooty 4y ago
  - kccoder 4y ago
    I've been scuba diving / freediving for more than a decade and very, very few divers ever go below 40m. The amount of training, equipment, risk, annoyance, time, ..., associated with 40m+ scuba diving just isn't worth it. Similarly, not a lot of people are capable of freediving to 40m+, and just a handful of people can freedive anywhere near 100m (without mechanical assistance). It would be very disappointing if a watch rated to 100m couldn't accommodate recreational scuba/freediving to 40m.
  - jitl 4y ago
    Sure but this rating is the same for Garmin or Suunto dive computers. EN13319, 100M water resistant. It’s industry standard.
kergonath 4y ago
> Yet you will still void the warranty if you dive with it: Your quotes don’t say that at all. They say it’s waterproof up to 100m but you should not use it deeper than 40m. There’s a lot to do under water between 0 and 40m.
- esotericimpl 4y ago
threeseed 4y ago
18m limit for Open Water. 30m limit for Advanced Open Water. Almost every recreational dive site for commercial reasons would only be taking divers down to those depths. If you're going beyond 30m then you know what you're doing and are not going to be reckless enough to use any device which is not rated for that depth. No one is going to care about warranty if they are dead.

jitl 4y ago

What do you mean? It’s rated to 100m, which is quite a bit below the 40m limit for most recreational diving.

teddyh 4y ago
“Rated to 100m” does not mean what you think it means. It means, essentially, that it theoretically would be safe at 100m depth, assuming you lower it slowly and don’t move it about at all. IIUC, local water pressure varies significantly when you move something around underwater, which is why “100m pressure proof” does not mean “can be brought down to 100m depth”.
- JohnBooty 4y ago
  IIUC, local water pressure varies significantly when you move something around underwater If Wikipedia can be trusted here, movement doesn't increase water pressure as much as we think: https://en.wikipedia.org/wiki/Diving_watch#Water_resistance https://en.wikipedia.org/wiki/Diving_watch#Water_resistance Movement induced dynamic pressure increase is sometimes the subject of urban myths and marketing arguments for diver's watches with high water resistance ratings. When a diver makes a fast swimming movement of 10m/s (32.8ft/s) (the best competitive swimmers and finswimmers can not swim nearly that fast) physics dictates that the diver generates a dynamic pressure of 0.5 bars (50kPa) or the equivalent of 5 meters of additional water depth. One other thing stands out to me... It means, essentially, that it theoretically would be safe at 100m depth It's interesting (alarming?) that they chose the "weaker" ISO standard 22810 for water resistance, in which a sampling of units are tested: https://en.wikipedia.org/wiki/Water_Resistant_mark https://en.wikipedia.org/wiki/Water_Resistant_mark ISO 6425 is much more stringent and specifies that every single unit is pressure tested to 125% of rated capability, ie a 200M ISO 6425 watch has been individually tested at 250M for a period of time.
  - jitl 4y ago
    ISO 6425 is generally used for dive watch, eg a Rolex Submariner, not dive computer. I don't know any dive masters who wear a dive watch while diving; they seem like mostly a fashion / status symbol kind of thing? I have no interest in them anyways. I looked at the Garmin spec sheets before buying my Apple Watch and didn't find any of their computer/watch combos listing ISO 6425. Instead they list a depth (usually 100M) and attest "Tested to engineering standard EN13319 for dive compliance", see https://www.garmin.com/en-US/legal/waterrating-definitions/ https://www.garmin.com/en-US/legal/waterrating-definitions/
    - JohnBooty 4y ago
      My understanding is that before the advent of dive computers, dive watches were used for diving so that you could time your ascents and so forth. That's what lead to the development of the (quite strict) ISO 6425 standard. they seem like mostly a fashion / status symbol kind of thing Yeah, this is my understanding from talking to diver friends. As a guy who likes watches yes, they're crazy popular in the watch community. They've become kind of a genre unto themselves. Citizen, Seiko, and others make affordable ISO 6425 models. I own a few, didn't pay more than $150 for any of them. Though, I dunno about the "status symbol" aspect. For $30 you can get a diver-style watch that looks like an actual ISO 6425 watch unless you know specifically what you're looking for. So I don't think anybody would be impressed by them. But they are fun to own and rather handsome, if you like that kind of thing.
  - teddyh 4y ago
    > If Wikipedia can be trusted here, movement doesn't increase water pressure as much as we think: https://en.wikipedia.org/wiki/Diving_watch#Water_resistance https://en.wikipedia.org/wiki/Diving_watch#Water_resistance I stand corrected, but the same article also states: “Water Resistant 100 m […] NOT suitable for diving.” “Water Resistant 200 m [.] Suitable for skin diving only. NOT suitable for scuba diving.” And, IIUC, WR100 is exactly what the Apple Watch Ultra has.
    - JohnBooty 4y ago
- kccoder 4y ago
  I've been scuba diving / freediving for more than a decade and very, very few divers ever go below 40m. The amount of training, equipment, risk, annoyance, time, ..., associated with 40m+ scuba diving just isn't worth it. Similarly, not a lot of people are capable of freediving to 40m+, and just a handful of people can freedive anywhere near 100m (without mechanical assistance). It would be very disappointing if a watch rated to 100m couldn't accommodate recreational scuba/freediving to 40m.
- jitl 4y ago
  Sure but this rating is the same for Garmin or Suunto dive computers. EN13319, 100M water resistant. It’s industry standard.

kergonath 4y ago

> Yet you will still void the warranty if you dive with it: Your quotes don’t say that at all. They say it’s waterproof up to 100m but you should not use it deeper than 40m. There’s a lot to do under water between 0 and 40m.

esotericimpl 4y ago

threeseed 4y ago

18m limit for Open Water. 30m limit for Advanced Open Water. Almost every recreational dive site for commercial reasons would only be taking divers down to those depths. If you're going beyond 30m then you know what you're doing and are not going to be reckless enough to use any device which is not rated for that depth. No one is going to care about warranty if they are dead.