What works, if anything, while a plan is suspended?

What works, if anything, while a plan is suspended?  The Garmin 'inReach Satellite Subscription Plan Pricing and Global Availability FAQ'  page includes the question:

Do I need an inReach satellite subscription plan for my inReach device to work?

"An active inReach satellite subscription is required for live tracking, messaging functions and syncing account information such as contacts, waypoints and routes. You must have an active inReach satellite subscription for SOS emergency messaging and services."  

However does the GPS work?  Thank you for any help.