GB Ordnance Survey Map reference for InReach Explorer+

Open a support ticket. I do not see a record of any firmware update which would remove this capability from the device itself. OTOH, are OS maps available on explore.garmin.com for Explorer+? (I no longer have an active legacy device with which to try this.) If not, how are you getting the maps onto the device?

Edited to add: F/W release history: https://support.garmin.com/en-US/?faq=IBu1vwkeOR3adZNyKcYFH6

Thank-you for the reply.  I've opened a support ticket.  OS maps are not available for download onto the Explorer+.  I don't have the maps on the Explorer+.  Instead I use paper maps (in a waterproof pocket) so I rely on the device to give me the OS 6 digit reference number for reading the location on the paper map.  My eTrex10 provides this info, by selecting the OSGB map system.  Perhaps the Explorer+ never had this capability, and I'm suffering from false memory syndrome thinking it did, applying eTrex10 features to the Explorer+.  Most of the times I've used the Explorer+ have been in the US or Asia, so I've been using lat/long.  Thank-you again for the reply, much appreciated.  Let's see what Garmin Support say...