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Old 11-05-2020, 13:29   #1
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Garmin GPSMAP 820 MFD WIFI data format

I'm trying to write software for an esp8266 micro controller board to receive NMEA data over wifi from a Garmin Gpsmap 820 mfd. The Garmin Android app connects to the boat wifi without a problem and mirrors the main display beautifully however I would like to know what data is sent over wifi from the Garmin? Is it standard NMEA sentences as well as the chart data and from what port and protocol (UDP/TCP). Finding the IP address of the MFD to listen to is not a problem as any Android phone/tablet connected to the wifi network gives me the Access Point IP.


The owner manual does not give the protocol/port no.



I already have the software for the ESP8266 running to receive the NMEA sentences sent from a B&G Zeus MFD (TCP and port 1011) over wifi so hopefully it's the same. I say hopefully as the new 46ft. yacht ordered for the charity I sail with on the Clyde in Scotland is 3/4 built in a factory in Germany and so will be VERY delayed.



I want acquire the raw data to allow me to program (among other things) an audio compass for the partially sighted and blind sailors we take out. I already have an audio compass app written and running on an Android phone so we know it will be of use.

Thanks for any help.
Neil
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Old 11-05-2020, 21:23   #2
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Re: Garmin GPSMAP 820 MFD WIFI data format

it's likely just streaming a video image with no raw data? but I could be wrong.
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Old 12-05-2020, 03:22   #3
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Re: Garmin GPSMAP 820 MFD WIFI data format

Hi Smac99
Thanks for the quick reply..Appreciated however I Do think it’s sending more than just video. Here’s the app that is working and does a lot more than display the charts. I’ll get there eventually. Thanks
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Old 12-05-2020, 03:24   #4
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Re: Garmin GPSMAP 820 MFD WIFI data format

Sorry forgot the link for the Active Captain app

https://buy.garmin.com/en-US/US/p/573254#overview
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