{
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          "sentence": "RMC",
          "timestamp": "2017-05-16T05:15:50.007Z"
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          "$source": "ttyUSB0.GP",
          "sentence": "RMC",
          "timestamp": "2017-05-16T05:15:50.007Z"
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        "headingMagnetic": {
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          "$source": "ttyUSB0.II",
          "sentence": "HDM",
          "timestamp": "2017-05-16T05:15:54.006Z"
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      "name": "Motu",
      "uuid": "urn:mrn:signalk:uuid:705f5f1a-efaf-44aa-9cb8-a0fd6305567c"
    }
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  "sources": {
    "ttyUSB0": {
      "label": "ttyUSB0",
      "type": "NMEA0183",
      "GP": {
        "talker": "GP",
        "sentences": {
          "RMC": "2017-04-03T06:14:04.451Z"
        }
      },
      "II": {
        "talker": "II",
        "sentences": {
          "HDM": "2017-05-16T05:15:54.006Z"
        }
      }
    }
  }
}