What remark is added to a METAR or SPECI observation report that is not transmitted?

The correct choice indicates a remark that signifies that the observation has been generated automatically and that no human input was involved in the process. METAR and SPECI reports are designed to communicate essential weather information to pilots and air traffic controllers, and the addition of remarks allows for further clarification or details.

When a remark is included in the report, it serves to inform the reader about specific conditions of the observation. However, certain remarks, like the one indicated in the chosen answer, are not transmitted as part of the official report, thus providing additional information that may be relevant in specific contexts but does not form part of the formal weather data.

In this scenario, distinguishing between various types of remarks is crucial for understanding how automated observations differ from those that may have been manually validated or adjusted. This understanding is important for interpreting weather reports in aviation settings accurately and recognizing the level of oversight involved in the data presented.