According to VMware, Infrastructure Navigator is
…a component of the VMware vCenter Operations Management Suite. It automatically discovers application services, visualizes relationships and maps dependencies of applications on virtualized compute, storage and network resources.
Effectively it takes a look at the network connections that are running between your VMs (and physical servers) and works out which applications and services are running on each, and the dependencies – both upstream and downstream – for each VM.
There’s no doubt that vCOps is a great product for proactively monitoring your vSphere environment, but it’s a hefty package for the lab. The minimum recommended RAM is a whopping 16GB – in my lab that’s the whole of my management host! I recently needed to do some testing so I wanted to get it running in the lab with the barest minimum I could get working, and it turns out you can get working with just 4GB and 2 CPU…albeit you wouldn’t want to monitor much!