What does ivno in a aviation notam mean?

In an aviation NOTAM (Notice to Airmen), "IVNO" stands for "In the vicinity of." It is used to indicate the approximate area or location where a NOTAM is applicable or relevant, but without providing specific coordinates or boundaries.

For example, a NOTAM might state: "IVNO Airport X, runway 18/36 closed for maintenance." This would mean that the runway is closed within the general vicinity of Airport X, and pilots should be aware of this closure when planning their flights.

IVNO is a commonly used term in aviation NOTAMs to provide a general indication of the affected area without the need for precise coordinates. It allows NOTAMs to be communicated more concisely and efficiently, while still ensuring that pilots are informed of important information related to their flights.