For how long is the MAD index valid?

The MAD index, which stands for the Mean Acoustic Depth index, is valid for a period of three days. This specific timeframe is established to ensure that the data remains relevant and accurate for operational purposes. Acoustic conditions in the ocean can change due to various factors such as temperature, salinity, and environmental influences, and a three-day validity period helps to account for these changes while still providing reliable data for decision-making. By limiting the validity to three days, users can ensure that they are working with current and applicable information, which is crucial for effective maritime operations.