Check the sub stats and see if anything is near with radar
Use binoculars to see close up
Atari ST Screenshots
Commodore 64 Screenshots
title screen (CGA and EGA versions)
The view on the surface (EGA)
Take a closer look at what's on the horizon (EGA)
A view of the surface (CGA)
Title screen (Hercules Monochrome)
Battle stations! (Hercules Monochrome)
TRS-80 CoCo Screenshots
Start screen - which monitor type are you using?
At sea, with the sunlight water reflections, and land in the distance
Using binoculars - nothing to see here
Your radar screen - guess I should turn it on, too...
One of multiple zooms of your map