On Monday, January 23, 2023 at 5:54:37 PM UTC-5, Andy Burnelli wrote:
sms wrote:
I always wondered why my iPhone Xr's GPS was not as accurate as that on
my Android devices. Now I know!
<https://medium.com/@importanttech/we-tested-mobile-gps-gnss-accuracy-and-found-some-surprising-results-b9ec35873e2e>.
Wish they would repeat this analysis on newer iPhones.
Notable conclusions...
The tested _iPhones suck at location accuracy_ when only GNSS is used.
The tested Android devices (Pixel & Galaxy) were far better in all ways.
*Often iPhones were more than an order of magnitude worse in accuracy!* *Often iPhones are five times less accurate than Apple _claims_ they are*
Who knew Apple lied about location performance of the iPhone. (quote)
"*The iPhone XR overvalued its accuracy by 450%*"
Notable charts... <https://miro.medium.com/max/720/1*6M1CWsA3IZ2M1i_Hja4umg.webp> <https://miro.medium.com/max/720/1*psFQY8BD491lDufnmBk1jw.webp> <https://miro.medium.com/max/720/1*eNRIxbWP6pwMKr2-LgOJdg.webp> <https://miro.medium.com/max/720/1*PozyVyqG6vPEEAsxMe-R9A.webp> <https://miro.medium.com/max/720/1*UqRd7xBpWV92uKC-43W2CA.webp> <https://miro.medium.com/max/720/1*dzQUtNSHSZI2Me8yu6CZEg.webp>
I limited this summary to just a dozen key takeaways...
1. GNSS refers to a variety of satellite systems used across the globe. These systems include GPS (US), GLONASS (Russia), Galileo (EU),
BeiDou (China), QZSS (Japan) and IRNSS (India).
2. Date: May 19th, 2020
Our next test will be in September 2020 (where is it?).
3. Why? We predict accidents with motorcyclists, cyclists & pedestrians.
4. Ultimate goal: Submeter accuracy. Not there yet.
But that's why typical achieved GNSS accuracy matters.
5. Half-inch accuracy using "Arrow Gold" Survey-Grade RTK Accuracy meter. <https://eos-gnss.com/products/hardware/arrow-gold>
6. Five common phones were tested.
Apple iPhone XR
Apple iPhone 6 SE
Samsung Galaxy 10 Note+
Google Pixel 4
Samsung Core A2
7. All five phones were tested under two fundamental conditions (five).
a. The path taken by the phone (straight vs. curved)
b. Use case of the phone (in hand, in jacket, in pants)
8. In all cases, Apple iPhones seriously underperformed in accuracy.
9. In all cases, Apple lied about the accuracy of their iPhones.
10. Precision was 20% higher precision when moving compared to when still.
11. Accuracy was better on longer paths than on shorter paths.
12. Accuracy & precision is better with phone held stable in your hand
and a coat pocket is better than a swinging hand or pants pocket.
In summary, Apple lied like Apple _always_ lies, and the tested Android phones outperformed the tested iPhones by an order of magnitude or more.
What else is new?
--
Posted out of the goodness of my heart to disseminate useful information which, in this case, is to
I cannot say anything about the XR iPhone, but I can about the iPhone 14 and iPad 7 or 9. I run ForeFlight for air navigation. One of the many settings is GPS accuracy. I'm in the house at the moment, not outside, and I'm showing a steady 4 meters here
in the office on my iPhone. I show 2 meters when I walk out to my front yard. The iPad 9's GPS shows 5 meters in the office and 4 meters outside. Both are more than acceptable for air navigation. Those readings are without WAAS, an FAA requirement for
devices approved for air navigation. WAAS gives 3 meters accuracy, or better, 95% of the time.
In years of using ForeFlight on iOS devices I have never seen any aberrations like those in your links. My Android experience with a Samsung tablet and Garmin Pilot was similar to iOS, no better, no worse.
--- SoupGate-Win32 v1.05
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