Hava gives you the ability to inspect route tables and visualise the connected resources on the diagram.
To view the route tables, select the cloud icon to the top right of your VPC diagram :
This will change the attributes pane to the right of the diagram and show a list of route tables.
To see the connected resources visualised, you can hover your mouse pointer over the desired route table and the connected resources will be highlighted on the diagram.
The background of subnets will change colour and individual connected resources will have a green border.