25-Byte Envelope EAR99

A 25-byte envelope is an ultra-compact message format designed to carry structured operational data within the minimum payload capacity of satellite burst messaging systems. Traditional messaging protocols carry hundreds or thousands of bytes of overhead — headers, checksums, session negotiation, and metadata — making them unsuitable for constrained transports like Iridium SBD (max 340 bytes) or Globalstar simplex (max 9 bytes per packet). A 25-byte envelope eliminates protocol overhead entirely, encoding actionable data directly into a fixed-length binary structure. This enables real-time command-and-control, position reporting, transaction processing, and emergency signaling over channels that would otherwise be limited to simple beacon pings.