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DavidLeblond

macrumors 68020
Original poster
Jan 6, 2004
2,351
701
Raleigh, NC
So a few weeks ago, my wife and I took our 4 year old to Yellowstone. We went out for a hike to a beaver pond, not sure how far we were going to go but the whole trail was a 5 mile long loop. So we set out and I said "oh, we should set a hiking workout!" So we both set a hiking workout at the exact same time.

Before I continue, the important specs. I (at the time) had an Apple Watch Series 4 and an iPhone 14 Pro. She had an Apple Watch Series 7 and an iPhone 11.

So we hiked a bit, doing well, not seeing any bears. And then we came across the beaver pond. My wife looked at her watch and said "well we're half way done with the loop. Might as well continue." I was giving my son some crackers and I didn't really pay attention to my watch.

So we hiked a bit more and my son started complaining and my wife said "we have one mile to go, so we're almost done!" I glanced at my watch and said "uh, it's a 5 mile loop. So we have 2 miles to go." She said "I know it's 5 miles. My watch says we've been 4." Sure enough, her watch said 4 miles my watch said 3. Around that point we saw people coming from the other direction so I asked them how far they had been so far. 2 miles.

After the hike (which involved a lot of carrying a 4 year old on tricky terrain) we looked at the data from our respective workouts. Exact same map shape. Just hers was 6 miles. Mine was 5.

What gives? I figured if one was going to be more accurate it would be the newer watch. Plus, we walk together all the time and have never had a discrepancy this big (usually the only differences is she forgets to set a workout at the same time.)
 
Likely the phone is being used for GPS, not the watch.
There were reports of the iPhone 11 GPS being iffy.


It might be worth finding a straight stretch of road with a known distance and walking with just the watches, no phones, then repeating it with just the phones, no watches, and see if there is a difference.

Coverage on a city street and a trail might be different (trees, buildings etc) but this might be a worthwhile exercise to try to narrow it down to a specific device.
 
Likely the phone is being used for GPS, not the watch.
There were reports of the iPhone 11 GPS being iffy.


It might be worth finding a straight stretch of road with a known distance and walking with just the watches, no phones, then repeating it with just the phones, no watches, and see if there is a difference.

Coverage on a city street and a trail might be different (trees, buildings etc) but this might be a worthwhile exercise to try to narrow it down to a specific device.
That was what my guess was at the time, but I figured the watch GPS would take precedence since it's more likely to be out of your pocket. Interesting.
 
That was what my guess was at the time, but I figured the watch GPS would take precedence since it's more likely to be out of your pocket. Interesting.

From S8 onwards it does

 
Also, were one of you guys using hiking poles by any chance? I hike with a group of guys and we get consistently different hiking distances between the guys who use poles & those that don't. I looked it up & something about the poles keep you from using the entire range of arm motion typical in a hike without poles, so the distance is off (I think it's shorter, but don't really remember for sure)
 
Also, were one of you guys using hiking poles by any chance? I hike with a group of guys and we get consistently different hiking distances between the guys who use poles & those that don't. I looked it up & something about the poles keep you from using the entire range of arm motion typical in a hike without poles, so the distance is off (I think it's shorter, but don't really remember for sure)
Nah. Towards the end one of us was usually carrying a 4 year old which might have had an impact maybe.
 
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