Garmin Packet Analysis

This is my start of a deeper analysis.  This is based on several packet captures.

The first "Boat One" was done at the boat with all the devices.  You can see it here:  http://cloudshark.org/captures/0befc7c09a18 
I also did a test of just the iPad on a network to see what iOS BlueChart would do.  http://cloudshark.org/captures/df6ba4ebec4e 
Here is a power up of just the Garmin 5212 MFD:  http://cloudshark.org/captures/824f2c3bc420 

All of the comments will be based on the packet numbers, etc found on the cloud shark pages.

 IP Address Description Note
 172.16.6.100 Macbook running Windows 7 
 172.16.6.3 Dlink DWL-G730 Access Point in Bridge Mode 
 172.16.6.101 iPad 3 IOS  
 172.16.3.0 GDS22 (Sounder) 
 172.16.6.0 GPSMAP 5212  (called Gamin on other pages) 
 172.16.7.0 5212 Data Server  
 239.254.2.1GDS22 is only device talking here. Multicast
 239.254.2.2 All Devices announce themselves here Multicast
 239.254.2.4 GPSMAP 5212 (6.0) only device talking here. GPS? Multicast
 239.254.2.8 (6.0) and (7.0) talk to start and then just (6.0) Multicast

Moving Tracks from Garmin to Ipad Analysis  Moving Tracks
iPad starting up on network without Garmin test:  iPad Only Test
Powering up of Garmin 5212 MFD test: Powering Up
Focus on traffice to 239.254.2.4:  239.254.2.4 Traffic

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