I found this on Garmin Support:
http://download.garmin.com/InReach/inReach_Field_Experience_Webinar-SOS.pdf Presumably GEOS understands over 200 languages and dialects, hehe.
EXCLUDED TERRITORIES
The GEOS SAR entitlement extends to all countries of the World subject to the following
excluded territories and are subject to change:
• Afghanistan
• Chechnya
• Democratic Republic of Congo (DRC)
• Iraq
• Israel (West Bank, Gaza Strip and Occupied Territories Only)
• Libya
• North Korea
• Somalia
• Syria