Missing NMEA input from TackTick 122

Juha Tolsa's Avatar

Juha Tolsa

10 Jun, 2015 08:34 PM

We've installed the box 11A and wlan & gps feed seems ok. However the nmea input from Tack Tick T122 to port A (orange wire) with nmea ground jumped to T122 ground/black&white/boat ground seems corrupted - "missing expected fields", screenshot attached. We tried with different baud rates, 38400, 9600 & 4800 without success.

Any idea what's wrong?


  1. Support Staff 1 Posted by kevin.dolan on 11 Jun, 2015 11:04 PM

    kevin.dolan's Avatar

    Hello Juha,

    If using the orange wire the baud rate should be set to 4800 or use the green wire which is already set to 4800, if the green port is not used with another 0183 feed. However this I expect will not correct the issue. It may be that the T122 is giving bad data or that their is a ground loop. I recommend moving one of the black or white wires to the NMEA (-) of the T-122. If is possible to power the unit then I would recommend moving both wires the NMEA (-). If the unit does not power on with both wires then just move one.

    Try moving NMEA ports and the ground wires and hopefully you come to a combination that makes the data transfer correctly. I am sorry I cannot be more specific but I have not seen this issue before and do not have a T-122 to test with myself.

    Let me know how this goes,

  2. 2 Posted by Harri Kinnunen on 23 Jun, 2015 06:36 PM

    Harri Kinnunen's Avatar

    For future generations' benefit, typed up this spiffy python script to log the DMK Box output stream:

    Output looks like this:
    received message: $GPGSV,3,2,12,20,28,259,32,19,17,028,24,40,17,146,35,18,16,329,35*79
    received message: $IIMWV,344,T,02.0,N,A*14
    received message: $IIVHW,,,,,00.0,N,,*19
    received message: $IIVLW,01372,N,000.0,N*54
    received message: $GPGSV,3,3,12,07,12,091,19,05,11,214,19,17,07,149,30,11,07,073,20*7B
    received message: $GPRMC,065457.000,A,6009.1656,N,02456.9818,E,0.04,196.07,230615,7.6,E,D*0C
    received message: $GPVTG,196.07,T,,M,0.04,N,0.08,K,D*3D
    received message: $GPZDA,065457.000,23,06,2015,,*52
    received message: $IIVWR,002,L,01.6,N,,,,*7A
    received message: $IIDPT,005.6,+0.0,*44
    received message: $IIMTW,+11.0,C*38

    Yes, the water is pretty darn cold for end-of-June.

  3. Support Staff 3 Posted by kevin.dolan on 23 Jun, 2015 08:44 PM

    kevin.dolan's Avatar

    Thank you for the log files and for the code. It will hopefully help customers in the future. Looking at your information it seems that the T122 is giving good data and I'm not sure what issue our app has with it. I would suggest trying to use it with iRegatta with "Ignore NMEA checksums" set to "On." It should work. Please let me know how this goes.

  4. 4 Posted by Juha Tolsa on 25 Jun, 2015 11:43 AM

    Juha Tolsa's Avatar


    connection with iRegatta works fine, seems that the problem is only in DMK app (which we were using only for testing/connection verification purposes). Thanks for the support.


Reply to this discussion

Internal reply

Formatting help / Preview (switch to plain text) No formatting (switch to Markdown)

Attaching KB article:


Already uploaded files

  • DMK.png 309 KB

Attached Files

You can attach files up to 10MB

If you don't have an account yet, we need to confirm you're human and not a machine trying to post spam.

Keyboard shortcuts


? Show this help
ESC Blurs the current field

Comment Form

r Focus the comment reply box
^ + ↩ Submit the comment

You can use Command ⌘ instead of Control ^ on Mac