🔍 Key Concepts

• NAVTEX transmission method for ensuring message integrity • Difference between FEC (Forward Error Correction) and simple repetition of data • How character-level error checking can be done in radio teletype-style systems

💭 Think About

• Think about whether NAVTEX is designed for ships to request retransmissions, or to be one-way, unattended reception that still corrects errors. • Consider how Forward Error Correction works compared to just sending the same information twice or resending whole messages. • Ask yourself if NAVTEX would more likely protect the whole message, each line, or each character to maintain accuracy in bad HF/MF conditions.

✅ Before You Answer

• Verify whether NAVTEX operates primarily using FEC or ARQ (Automatic Repeat reQuest). • Check if the system design allows for retransmission on request, or if it must assure accuracy within a single broadcast. • Confirm whether accuracy is handled at the message level (retransmit), line level (parity at end of line), or character level (encoding / duplication).