In order for you to play Atlantic Fleet on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
OS X Version 10.6.3
Processor (CPU):
1.6GHz (Dual Core) Intel CPU
Memory (RAM):
1 GB RAM
Graphics Card:
Shader Model 3 Capable Graphics Card
Storage:
400 MB available space
In order to play Atlantic Fleet on macOS with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
OS X Version 10.6.3
Processor (CPU):
2.2GHz (Quad Core) Intel CPU
Memory (RAM):
4 GB RAM
Graphics Card:
Shader Model 3 Capable Graphics Card
Storage:
400 MB available space