Question

Hi,

FMB 120 unit sends bad values for latitude in couple of seconds.

For example in one moment it sends value of latitude 46.9975583 and after 20 seconds we get 44.9975564. This happens periodically for couple of our units. What can be cause of this? Please check table below

latitude		gps_sat	21-gsm signal	tmestamp
46.9975583		19	4	2020-09-01T12:21:45.000+00:00
46.9975583		18	4	2020-09-01T12:22:15.000+00:00
44.9975564		6	0	2020-09-01T12:22:34.000+00:00
44.9975564		20	5	2020-09-01T12:23:14.000+00:00
44.9975564		20	5	2020-09-01T12:23:15.000+00:00
46.9976483		18	5	2020-09-01T12:23:18.000+00:00

Answer 1

Hello.

Well satellites are not stationary, they move, so it is pretty normal, that even when GPS device is stationary, that longitude and latitude are not constant, because as you see number of visible satellites also changes which can influence this behaviour. Some deviation in coordinates is normal for GPS devices

Best Regards

Comments

Hi,

yes I agree, but this is big difference in value, if you assume that value for longitude you get same as previous one, and value for latitude is changed from 46 to 44

Answer 2

Hi,

Could you please let me know the firmware version? Does this issue always occur in the same manner (2 degree decrease in value for latitude)?

Best regards

Comments

Hi,

yes usually it happens like this from 46 to 44. This is problem for us because of this error our devices shows up 200-300 km from real location. It is 03.18. firmware.

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Hi,

Do you perhaps have some sort of raw data log received in server when this issue happens and doesn't happen? I would take a look.

Best regards,

---

Hello.

Firmware you are using is outdated, to get latest firmware, please
contact your sales manager.
If you don't have any contacts with our Sale managers, please contact with them on our official
website https://teltonika-gps.com/
and click on the "Contact Us" button. When you will click, please fill the form and submit it.
Note: as a topic, please choose "Vehicle telematics".
Or you can send an e-mail with description of your situation to info@teltonika.lt

See if after update issue still occurs, you can also contact us and explain your issue, so that one of our engineer could help you in solving this issue.

Best Regards

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Hi,

thanks, we will try to update our firmware and then track what is going on