Author Topic: new smartphone, LMP recording very few points. CAT S42 from CAT S41  (Read 161 times)

Offline pat22043@gmail.com

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I have just replaced my old CAT S41 with a new CAT S42. I've been using Locus Map Pro for ages and love it. But its not happy on my new phone. I'm running version 3.49.1 of LMP. The phone runs Android 10

Over a 3+ hour ride, Locus Map Pro recorded only 100 points. I also run a Garmin GPSmap 64ST to record the track, and it recorded 1353 points. The LMP recording missed a lot of points, it says that the track is about 7 miles long, while the Garmin track says it was 18.8 miles. Clearly the LMP missed a lot.

I am guessing that this is either a setting on the LMP app, or on my S42 smartphone. But I have no idea what could do this.

I've attached the two GPS files

How can I debug this?
 

Offline balloni55

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Re: new smartphone, LMP recording very few points. CAT S42 from CAT S41
« Reply #1 on: November 21, 2020, 18:49:01 »
Hello
main problem on new devices are the aggressive akku save options
please take a lock at
https://docs.locusmap.eu/doku.php?id=manual:faq:gps_lost_fix_android6
your device isnĀ“t listed there till now but the path should be clear when you have read this.
 Exclude LMP from all those "save" options!

And additional on android10 there you have to allow use "location always" for locus, not only while use,
inside settings of your device.
Wolfgang
« Last Edit: November 21, 2020, 18:54:16 by balloni55 »
Locus PRO 3.49.1
 

Offline pat22043@gmail.com

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Re: new smartphone, LMP recording very few points. CAT S42 from CAT S41
« Reply #2 on: November 21, 2020, 19:29:06 »
OK, I've read the links. changed the settings for the battery optimization
So for a CAT S42 the battery optimization is controlled by:

setup -> apps & Notification  -> advanced-> special app access -> battery optimization ->all aps-> locus map ->don't optimize

I've changed it and will check next time I hit the trails.

Thanks
« Last Edit: November 21, 2020, 20:51:30 by pat22043@gmail.com »
 

Offline michaelbechtold

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Re: new smartphone, LMP recording very few points. CAT S42 from CAT S41
« Reply #3 on: November 21, 2020, 22:12:35 »
PS: do not forget Wolfgangs "allow use "location always" for locus,"
 
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Offline pat22043@gmail.com

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Re: new smartphone, LMP recording very few points. CAT S42 from CAT S41
« Reply #4 on: December 02, 2020, 03:50:24 »
I have the Android "location permission" set for Locus to "allow all the time"
and I set the power-saving options to "not optimized"
The attached GPX is better, but still is missing a lot of points (you can see straight lines)

I must be missing something
Thanks
 

Offline balloni55

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Re: new smartphone, LMP recording very few points. CAT S42 from CAT S41
« Reply #5 on: December 02, 2020, 08:25:07 »
now it looks better already...
the question is,
what was different in the time from 15:33:19 to 16:47:37 and from 17:16:13 to 17:40:40
and why were the reception conditions worse between 17:9:42 and 17:10:39?

- what are the settings in the recording profile? i have good experience when cycling with: distance interval=10m, time interval=5s, recording condition = distance and time

- for monitoring it is also helpful to record NMEA data while recording >  settings/GPS and sensors/NMEA recording = track recording

Locus PRO 3.49.1
 

Offline pat22043@gmail.com

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Re: new smartphone, LMP recording very few points. CAT S42 from CAT S41
« Reply #6 on: December 02, 2020, 14:59:43 »
I have no idea why some times were just thrown out. I was also recording a track on my Garmin GPSmap 64ST, and it had no issues, no missed points. It was set to the default "car" setting. I'll change it to your values for my next session.

I've riding a dirt motorcycle. The land is old coal mine land, valleys and ridges. No buildings at all. Usually open sky for good satellite visibility. Of course, sometimes you are along the side of a ridge, so there is solid rock blocking sky visibility to one side

I'm running LMP "as a service" if that makes any difference. I thought it might help keep the operating system from messing with it.

I can try turning on NMEA style output. Other than the format of the data file, what difference does that make?
 

Offline michaelbechtold

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Re: new smartphone, LMP recording very few points. CAT S42 from CAT S41
« Reply #7 on: December 02, 2020, 18:48:49 »
The NMEA data is RAW data, coming from Android level, BEFORE interpretation by Locus.
I once had a phone that had a faulty GPS module (or wiring after a repair) and would deliver only 30% of the expected points, and also with huge delays.
 

Offline pat22043@gmail.com

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Re: new smartphone, LMP recording very few points. CAT S42 from CAT S41
« Reply #8 on: December 02, 2020, 19:43:45 »
That is a good point. I've also been having the same issue (missing points, long time between locations) on Glympse, another Android application