It is not unusual for the ASW search phase to go on for long periods without any positive contact. This is not, however, negative information. These calculations use measured in situ parameters and can be supplemented with the latest intelligence information from the network to generate threat density maps that show the area searched, the current search, and the projected search based on own ship track. These maps are refreshed with time and would change as old search areas become cold. A threat density map for a given area may be transmitted in grid format, allowing quick transfer of information.
Techniques exist that allow the fusion of multiple platform searches into a composite picture.
All the information that was used in the calculation of the map could be transmitted, as time permits. The use of the network in ASW can affect as many levels of the decision hierarchy as the imagination and technology will allow. There are many possible methods for connecting sonar shacks and intelligence sites. Sonar operators tend to hesitate calling contacts until their confidence builds. This results in lost time, lost opportunities, and potentially lost ships.