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    2/02/2020 2:04 pm  #1

    Stedfeldt
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    Registered: 2/02/2020
    Posts: 5

    Output/update frequency to NMEA2000 (NGT-1)

    I'm trying to send data from Expedition to Garmin GNX120 over NMEA2000 (NGT-1). I have no sensors connected, to the network, only displays. Running in simulation mode to generate data. In Expedition data is updated at a rather high frequency. The GNX120 seems to update in 0.25Hz (every 4th second).. When sending the same data over a custom channel I get an update every 6th second. I have no damping in Expedition. I have the latest firmware in the NGT-1. What update frequency could I expect with NGT-1 and GNX120.

     

    2/02/2020 2:20 pm  #2

    Nick
    Moderator

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    Registered: 9/16/2015
    Posts: 2,751

    Re: Output/update frequency to NMEA2000 (NGT-1)

    The Garmin PGNs are large, so have some frequency limitations. From the Exp help:Update ratesEach Garmin display can update at 5Hz at most.These are large data packets, and are sent at most at 10Hz, so sending more data will reduce the refresh rate. For example1 custom channel will update at up to 5Hz
    2 custom channels will update at up to 5Hz
    5 custom chanels will update at up to 2hz
    10 custom chanels will update at up to 1hz

     

     

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