[ Considering Heroes are well-paid compared to locals, Setsuna doesn't have to worry about Jumin's colle problem at least. If he works hard, that's more than enough to regain it and earn more. For now, they need to focus on something more important.

Since it's going to take a bit to arrive to Petrosian though, they might as well converse as they travel. ]

Unfortunately, I am not certain. Perhaps there are communication radios existing somewhere, but I have yet to encounter one. The popular means of contact are through traditional mails.