I have been using the Apple Watch Ultra as my dive computer for two trips - Cabo and the Florida Keys - and have 8 dives logged. During my trip to the Keys, I noticed I was seeing very high max ascent rates on my dive logs. I was pretty surprised by this so I wanted to dig into the data and see when this was occurring.
First, here is a screen shot of one of the logs in question:
You can see that it reports a max ascent rate of 111ft/min (!!!) but the color coding on the chart shows that I was only in the 30ft/min range a few times during my dive. I can understand than maybe some short durations could have exceeded that, and just are too short to visualize on the graph. So, I wanted to dig in a little deeper...
I got the AWU2UDDF app, and converted my logs to XML files. I then wrote a short Python script to get the data into a csv file. The file has a data point every 2.649 seconds. Here's a plot of my dive data with the ascent rate and the depth vs. time. As you can see, I do get close to the 60 ft/sec band, but I don't see anything at 111ft/sec.
So, here are my questions:
1. Does the watch have the ability to record and process data more frequently than what is being stored in the health app?
2. If so, and the 111 ft/sec rate is real, but occurred for a duration less than 2.65 seconds, should I be concerned?
3. I am guessing that some of the fast rates are due to the watch being on my wrist, and I was using a mooring line for the ascents, and so my hand could move more quickly up the line than the rest of my body. Is that a concern?
Looking forward to some thoughts on this.
First, here is a screen shot of one of the logs in question:
You can see that it reports a max ascent rate of 111ft/min (!!!) but the color coding on the chart shows that I was only in the 30ft/min range a few times during my dive. I can understand than maybe some short durations could have exceeded that, and just are too short to visualize on the graph. So, I wanted to dig in a little deeper...
I got the AWU2UDDF app, and converted my logs to XML files. I then wrote a short Python script to get the data into a csv file. The file has a data point every 2.649 seconds. Here's a plot of my dive data with the ascent rate and the depth vs. time. As you can see, I do get close to the 60 ft/sec band, but I don't see anything at 111ft/sec.
So, here are my questions:
1. Does the watch have the ability to record and process data more frequently than what is being stored in the health app?
2. If so, and the 111 ft/sec rate is real, but occurred for a duration less than 2.65 seconds, should I be concerned?
3. I am guessing that some of the fast rates are due to the watch being on my wrist, and I was using a mooring line for the ascents, and so my hand could move more quickly up the line than the rest of my body. Is that a concern?
Looking forward to some thoughts on this.