So the Nautilus 1 's GPS lets you store GPS points with date and time reference. It does that automatically after it has been activated and gound it's position. And you can read out the GPS coords on the display and if you dealt with an older marine radio at the other end you could communicate your coords that way also.
You can also download your GPS log ... and see where e.g. the boat actually was on that dive...
You also could (I think, never tried, lack of reason) switch it on, close the lid, go diving and when you happen to come across that Spanish armada gold carrying wreck everyone else missed, you can attach it to a reel line, let it pop up, wait 5 minutes to be reasonably sure it found it's position and then you might re-find your treasure when you com back at midnight.... or some such use...
The Nautilus 2 does not have the radio communications feature. I got that.
What other features mentioned above does it not have?
You can also download your GPS log ... and see where e.g. the boat actually was on that dive...
You also could (I think, never tried, lack of reason) switch it on, close the lid, go diving and when you happen to come across that Spanish armada gold carrying wreck everyone else missed, you can attach it to a reel line, let it pop up, wait 5 minutes to be reasonably sure it found it's position and then you might re-find your treasure when you com back at midnight.... or some such use...
The Nautilus 2 does not have the radio communications feature. I got that.
What other features mentioned above does it not have?