Jet reports is essentially a connector between NAV and Excel, it allows refreshing of report content directly from the Live NAV system in the excel report, you then use pivot tables to produce reports
There is a free version that is supplied with NAV and then various paid version that offer more functionality, and it is capable of doing more, this is just what we find to be the core of it
A lot of our clients are using the free version and getting great benefit so well worth looking at
Cheers
Nev