North Atlantic '86 is a computer wargame written by Gary Grigsby for the Apple II and published in 1983 by Strategic Simulations.
The back story showed that Warsaw Pact forces had successfully overrun most of Western Europe by the end of August, 1986.
Game play options allowed two human players to pick either the NATO or Soviet Union.
In Grigsby's prior games, the computer kept track of the number of torpedoes carried on each ship and submarine.
Other weaknesses of North Atlantic '86 included the ability of unarmed search and cargo aircraft to go anywhere they had the range to go, immune to enemy fighters.
He worked on the game part-time for the first half of production, while holding a full-time civil service position.
There were many additional features, such as electronic warfare, missile attacks, and the ability to conduct airborne assaults using paratroopers.
Game operations allowed certain forward bases to be captured and recaptured which made the possession of Iceland especially valuable.