No gps fix matek H743-SLIM and m8n gps

Hello everyone,
I am trying to connect gps ublox m8n to my board matek h743. I use uart


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In the images I show my setup. Can you help me to figure out what might be the issue.

How have you configured the GPS parameters in ArduCopter?
Without that information we can not tell you what the problem might be.

what do you mean by that, I am very new to the topic so I adjust some GPS related parameters
These are the parameters I changed

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https://www.mateksys.com/?portfolio=h743-slim#tab-id-5

You only have one GPS receiver:

SERIAL3_PROTOCOL = 5

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yes it is GPS
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serial3_protocol_5 (gps)
check the baud rate
then ensure crct serial port
serial1 telem1
serial2 telem2
serial3 gps1
serial4 gps2

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when I changed serial 3 gps 1 in MP it says unhealty eventhough I went outside.


serial3 gps1
serial4 gps2
when I use this setup it says no gps
I check online baudrate should be fine

    • crct serial port I dont understand what port
1 Like

check that connnection on your gps tx &Rx
then check gps_type 1 for auto detect gps

do you mean real connection I checked it via Continuity with a Multimeter.
I change it to auto still nothing. But I get Pre arm need alt astimate. Can this be related or source of the problem?
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“GPS: No Fix” means:

  • GPS ↔ FC communication is working fine
  • GPS does not receive signal from satellites because it is indoor

Solution: Perform the test outside with clear sky view in all directions!

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check that indoor hdop its 100 you go outside and check sat count t

yes I try that solution but still zero satt count. That is the issue I am trying to fix

Wait 10 minutes outside with a clear sky view in all directions and with the gps antenna away from other electronics.

Post a picture

I did but still nothing. I think I am doing something wrong because I try with different board and still get the same error. GPS no fix

I try again and it worked. Thank you for your help