But when all you have is a cell phone?????
A regular consumer cell phone?
https://www.att.com/buy/phones/or
A global satellite device?
https://www.business.att.com/products/satellite-connectivity.htmlAs a reminder, you did say this:
That may be difficult to do for him now he is leaving for open water to Hawaii.
A regular consumer-level cell phone connection is not going be much help when you are in the middle of the Pacific Ocean, between North America west coastline and the Island of Hawaii.