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moved Future stuff here and updated RTK links - online edit of handbook/computing/myphone.html

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Philip Sargent
2025-05-11 16:25:46 +01:00
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handbook/computing/myphone.html
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@@ -24,7 +24,7 @@
<p>Do <em>not</em> select the "high accuracy" location setting on your phone. Mostly this will snap your position to the nearest cafe or bierstube: by default it will use the nearest WiFi it can find and assume that you are there, and will ignore the perfectly reasonable GPS position it has recorded directly.
<p>This is all explained by Google <a href="https://support.google.com/maps/answer/2839911?hl=en&co=GENIE.Platform=Android">here</a>.
<p>On the plateau, this "high accuracy" mode will simply give you the <em>wrong</em> position if it can't get a decent GPS fix. There is poor cell tower reception too, so trying to use that for location is just as bad.
<p>On the plateau, this "high accuracy" mode will simply give you the <em>wrong</em> position if it can't get an excellent GPS fix (but we only need a "good" one). There is poor cell tower reception too, so trying to use that for location is just as bad.
<p>What you want is GPS and <em>only</em> GPS (more precisely <a href="https://en.wikipedia.org/wiki/GNSS_applications">GNSS</a>: which includes GPS, Glosnas, Beidou, Galileo etc.).
<p>If you do not have a good GPS fix, <em>you want to know that</em>, not be given some confabulated guesstimate by whatever some programmer for Apple or Android thought your might want.
@@ -33,7 +33,7 @@
<h2>Privacy settings - not what we want here</h2>
<p>When you share photos on your phone to the Expo photo sharing site, by default, the location of those photos will be stripped out. So all those lovely pics of intriguing cave entrances you snapped on your walks are now utterly useless.
<p>Google Photos is for TEMPORARY sharing only <a href="#temp">*</a>. Archival storage must be done by uploading to the website using the <a href="/photoupload/">"Upload Photos"</a> page on the website.
<p>Also, Google Photos is for TEMPORARY sharing only <a href="#temp">*</a>. Archival storage must be done by uploading to the website using the <a href="/photoupload/">"Upload Photos"</a> page on the website.
<p>So, before expo, perhaps while sitting in a traffic jam around Munich or on the train from Bad Ischl, take a moment to photograph your travel companions in an embarassing pose and fix the this:
<ol>
<li>Go to Apps on your phone, select Google Photos, and allow the app to access Location on your phone (NOT "precise" location) when the app is in use.
@@ -92,7 +92,13 @@ You need to record if SBAS is in operation whenever you record the position of a
<p> <a href="https://www.cavinguk.co.uk/info/locatingsurveys.html">Location fixing: How to obtain a fixed point for a cave survey</a> (2020) "Galileo High Accuracy Service (HAS) is due to become partly available in 2022 and fully available in 2024, which will offer RTPPP for free around the world, both via satellite and network connections. And there will be much rejoicing. "
This is an excellent article and nearly all of it is still absolutely true, e.g.:
<blockquote>Keep the device very still. If the position shown by GPSTest slowly refines then stops updating within a minute or two, or shows only the last digit changing slowly, <em>then your device cannot be used for averaging</em>. A device with 1 metre accuracy still shows the 6th and 7th decimal place digits of the longitude and latitude updating every second or so (that is a roughly 10 cm wobble every second). Unless your device can actually do 1 cm accuracy, you should be seeing those numbers change! In general, this makes most phones unusable for this purpose"</blockquote>
<p>Unfortunately RTPPP has not actually caught on [2025] and it is still only available for experts and phones supporting L2 and L5 frequencies have been slower to appear than we hoped.
<p>Unfortunately RTPPP has not actually caught on [2025] and it is still only available for experts and phones supporting L2 and L5 frequencies have been slower to appear than we hoped. Read Wikipedia on <a href="https://en.wikipedia.org/wiki/Real-time_kinematic_positioning">Real-time kinematic positioning (RTK)</a>.
<hr>
Go on to <a href="/handbook/computing/gpxupload.html">Saving your GPS tracks</a></body></html>
Go on to <a href="/handbook/computing/gpxupload.html">Saving your GPS tracks</a><br />
Go on to <a href="newcave.html">Next survey guide page</a> - 'Base Camp: getting it in to the computer'<br />
<br />
<a href="/handbook/computing/myphone.html">Your phone on expo</a> - Do not select the "high accuracy" location setting on your phone<br />
<a href="/handbook/essentials.html">GPS essentials on the plateau</a> - Safety information<br />
<a href="/logbookentry/2024-07-21/2024-07-21c">Photo GPS</a> - Is unreliable unless you follow procedure<br /></body></html>