Someone set up a simple but nice way for the world to check on the progress of Chalkies record flight (Cape Town - London - Cape Town on less than 200 HP). I don't remember the details but it was the same kind of equipment they use in South Africa to check migration patterns of elephants or something like that.
Worked on the Southern Hemisphere only, until they fixed the script... :-)
You might be able to track those guys down, starting from here:
http://www.pprune.org/aviation-histo...otographs.html
Henshaw-Challenge Cape to London To Cape > Home
I don't think it includes in-flight messaging though. But who knows, maybe that can be added.