I'd heard otherwise. I contacted Garmin to ask if the Explorer + could be used just as a GPS without the monthly subscription, and was told no, that you need a subscription to use anything on the device.
From Garmin on April 6th(so things may have changed since):
Thank you for contacting product support. At this time you would need to have a subscription plan to use anything on the device. This is something that could change in the near future that would allow you to use the device just as a GPS without a plan. *You would want to sign up for the Freedom Plans as this would allow you to suspend your service when you are not using your device.*
If you need to use the device at this time you would need to have an active plan. I do apologize for any inconvenience.*
If you should have further questions feel free to reply to this email.*
Have a nice day!*
Thank you for choosing Garmin,
Allyson
Product Support Specialist -Outdoor
InReach, a Garmin Brand