Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 20-01-2016, 06:19   #1
Registered User
rgleason's Avatar

Join Date: Mar 2012
Location: Boston, MA
Boat: 1981 Bristol 32 Sloop
Posts: 7,460
Wiresharking Radar Gofree Navionics Android UDP Mulitcast Sleuthing

Some of you are wizards at connections & radar, here is information about connecting things and sleuthing and a pretty good blog for Marine Electronics by stripydog. The last post talks directly about Radar over wifi. (I think we will find it is best to keep radar & data on separate wifi channels, whatever the protocols involved.)

It might be helpful sometime, or get people thinking...
Did not know where to put this.

Gofree, Navionics,
Navionics SonarChart™ Live on Android
Water and Electrickery: Navionics SonarChartā„¢ Live on Android

Of interest to me was the use by Navionics Charts of cell phone data bandwidth.. another reason for OpenCPN Android!

Marine Data Transports revisited.
Water and Electrickery: Marine Data Transports Re-visited

Meantime though, 96% packet loss clearly makes broadcast/multicast over wifi non-viable. The alternatives?
  • Use TCP. Easy. Well supported
  • Use UDP unicast. Client addresses must be known in advance or some (currently non-existent) subscribe/publish protocol needs to be developed for marine data
  • Use an access point which implements UDP multicast over 802.11 unicast (as discussed in the RADAR post). Support for this is rare, as is support for NMEA-0183 data over multicast.
For most people the solution for now would seem to be to use TCP for delivering marine data over wireless networks.
Radar over Wifi not always a pretty picture
Water and Electrickery: RADAR over wifi: Not always a pretty picture

OpenCPN plugins support overlay of imaging from some Garmin and Navico RADAR units. Unfortunately some users attempting to use these plugins over wireless networks on their boats have encountered issues. Not only does it not work very well, it can make the whole wireless network unusable.
Signal K - iKommunicate

Getting pretty complex now.
rgleason is online now   Reply With Quote

navionics, radar

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Simrads GoFree App on Android devices alctel Marine Electronics 1 13-02-2016 23:11
UDP reuse? rsl360 OpenCPN 12 03-07-2014 21:23
Need help broadcasting NMEA data over a local network using UDP RhythmDoctor OpenCPN 3 02-05-2014 04:53
Simrad gofree chrysm Marine Electronics 3 02-11-2012 12:09

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 19:30.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.