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Very interesting thread, thanks.

I'll take a look at the GLO but
1. Over recent years I've become increasingly committed to the 'one device for all purposes' camp. Even leaving my Canon IXUS 220 HS at home now.
2. Even walks (hikes) of 10-12 miles, at leisurely pace with frequent stops, often discharge the iPhone 6S+. Bluetooth is a heavy power consumer. What's your practical experience?

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I saw your comment in that linked thread about the iPhone capturing several trackpoints per second. I'm fairly sure I recall reading elsewhere that the rate was "1 per sec". Can't find my source now.

That apart, what do think about my tenative conclusions earlier that accuracy decreases as trackpoint rate increases? Not only altitude (which I've almost given up on) but distance too, albeit to a lesser degree?

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Terry Pinnell, East Grinstead, UK

Thanks Boyd, appreciate the feedback - particularly the heads up about wrong forum!

I've also posted in another GPS forum, a GPS newsgroup, and a coupel of iPhone/iPad forums.

Love my 6S+ too (updated to 9.3.5 yesterday), but a major use is GPS recording, so anxious to sort this.

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Terry, East Grinstead, UK

Thanks Boyd, helpful feedback.

I'm also finding that the iPhone seems poorer at recoding signals than it was.

I've simplified my illustration of the high rate of trackpoints:



Reckon there's something wrong with iOS 9.3.4, although it's still possible the fault lies with Mem-Map.

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Terry, East Grinstead, UK

Thanks, fair point. On the assumption that there are 'iPhone GPS' users here, I was trying to keep it crisp, but I guess a little more background would have been helpful! 

I use the Memory Map app on the iPhone to record the GPS data. So far I've found no way of altering the rate of this data capture, unlike many dedicated GPS devices and perhaps smartphones. As you see from the more recent examples (red in my table) every GPS change is recorded, with a typical interval as brief as 2-3 seconds. Leading to very close points and therefore a large total number of them.

An exactly flat walk of even as little as one minute could result in a good estimate of distance, say 250 ft. But, because altitude estimates by GPS are very inaccurate, even for dedicated devices, it would give a highly misleading estimate of gross ascent and descent, maybe over 100 ft a minute on my iPhone 6S+!


After transfer of the GPS file to my PC I open it in the desktop Memory Map application to display and work on it. From there I can save in the universal GPX format for work in other progtams, such as Google earth, GPS Utility, etc.

Naturally, I've emailed Memory Map too.

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Terry, East Grinstead, UK

There has been an enormous increase in the number of trackpoints that my iPhone 6S+ is recording for recent walks. I haven't pinned down the cause yet. Could be some mistake of mine, a setting or whatever, although I'm darned if I can see any on the iPhone.

Here is a selection of results:



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Terry, East Grinstead, UK