signalk-sbd-msg v1.0.3

signalk-sbd-msg

Encode and decode messages sent over Iridium. Mostly just doing position, sog, cog so web AIS services can know vessel position.

For use by signalk-sbd

Last minute code to get signalk-sbd to work with a server. This is split out into its own package so that the server has access to decodeMessage.