"What props/items do I need to make it look authentic for a reenacted scene where a solo sailor communicates to a doctor via the Internet while sailing in the middle of the Atlantic ocean?"
If you were filming us while we exchanged emails with a Dr. from our boat - which we have done multiple times - you would see us using a laptop, our SSB radio
would be turned on, and there would be a small box (probably not even noticeable unless you called attention to it with your camera), a Terminal Node Controller or TNC that serves as the ''modem''.
This hardware would be the same in all cases where packet radio
technology is used, whether one is using an amateur radio
or marine radio
. However, it would NOT be real time. E.g. a message would be sent from the boat in a few seconds to the shore station, it would be posted to the Web within a few minutes (1-4 or so) but a reply would be dependent on when the Dr. viewed his email, when he replied, and when the boat subsequently reconnected with the shore station to pull down the reply.
Visually, this would all look very anticlimatic...but it is the most commonly used form of email on boats these days, presuming they are away from the dock and too far away from the coast to use cell phone/laptop capability.