When you are at a client to do that valuable business case you no longer need to be concerned about getting online. You can now use Shark entirely offline.
When you login to Shark you will be asked if you would like to enable offline.
Once enabled Shark will download your most recent sessions so you can work offline straight away. To guarantee a session is always available offline (rather than just your most recent) you can select the session card menu and toggle Available offline.
You can disable or enable the offline capability at anytime from the preferences screen.
There is also a handy message to show when you are offline or online.