From the introduction: "S I N C is a game of strategy, devoid of any element of chance. It is a game in which two players match their strategic acumen by engaging two opposing fleets of symbolic warships. One fleet represents the Eastern Hemisphere and the other the Western Hemisphere."
As the full name suggests, SINC is an obvious product of the Cold War period intended to simulate a fleet battle between the U.S. and U.S.S.R.
The game was published in two editions. One version comes in a standard long box and contains 34 substantive metal ship pieces. A second version comes in an album-style slipcase and serves as a travel edition, with 34 magnetic ship components clearly identifiable via their silhouette, name and classification.
The ship classifications drive the comparative cruising and firing capabilities of the various warships which they emulate.