Satellite accuracy on a mobile

How accurate is the position calculated by your smartphone? As mentioned in the previous post, the Royal Institute of Navigation is sceptical. Its new book on electronic navigation for leisure sailors says: “At sea, mobile phone positioning uncertainty will typically be several hundred meters or more, which may be enough to put us into danger”.

I am looking for some proper studies on this issue, because I am sceptical about that statement. In the meantime it’s easy to check what your phone tells you about its own location performance when it relies only on satellite signals.

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Are phones reliable for navigation?

The Royal Institute of Navigation’s excellent new book on electronic charting is pretty tough on the use of smartphones as chartplotters, claiming their accuracy can be as poor as 200 metres or worse. I think they may be out of date on this narrow point of phone accuracy, which I’ll come back to in a later post. But in the meantime I’ve had a demonstration of a different smartphone problem, one I had not focussed on before: unreliability in cold weather.

One of the nicer things about lockdown (if there are really any at a time of rampant virus) is to go most days for long walks in the winter cold, which is how I discovered that my phone seriously dislikes low temperatures. Not just sub-zero, but any day with temperature near or below zero. When there’s a strong, chilling wind it even goes on the blink in an outside pocket with the temperature in high single figures.

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