ICES statistical rectangles have been in use since the 1970's, and were first officially referenced in CM document 1977/Gen:3 document '*ICES Statistical Rectangle Coding System*'.

ICES statistical rectangles provide a grid covering the area between 36°N and 85°30'N and 44°W and 68°30'E.

**Latitudinal row**s, with intervals of 30', are numbered (two-digits) from 01 at the southern boundary (latitude 36°00'N) and increasing northwards to 99. The northern boundary of the statistical rectangle system is, thus, latitude 85°30'N.

**Longitudinal columns**, with intervals of 1°, are coded according to an alphanumeric system, beginning with A0 at the western boundary (longitude 44°00'W), continuing A1, A2, A3 to longitude 40°W. East of 40°W, the coding continues B0, B1, B2, ..., B9, C0, C1, C2, ..., C9, etc., using a different letter for each 10° block, to the eastern boundary of the area covered. Note that the letter I is omitted. Thus:

**Longitudinal column ** of ICES rectangle | **Coord****inates** |

A | 44°W-40°W |

B | 40°W-30°W |

C | 30°W-20°W |

D | 20°W-10°W |

E | 10°W-00° |

F | 00°-10°E |

G | 10°E-20°E |

H | 20°E-30°E |

J | 30°E-40°E |

K | 40°E-50°E |

L | 50°E-60°E |

When designating an ICES rectangle, the northern coordinate is stated first. Thus, the rectangle of which the south-west corner is 54°00'N 03°00'E is designated 37F3.

Usually, it is necessary to specify an area with more precision than is possible with a statistical rectangle designation. Therefore, a sub-rectangle designation must be given (as a fifth character) by dividing a statistical rectangle into nine (10' latitude x 20' longitude) sub-divisions, as follows:

For example:

A location 58°12'N 10°33'E would lie within ICES rectangle/sub-division 45G0**5**