Canada 1:250,000 Topographic Map Index
Steven Dutch, Professor Emeritus, Natural and Applied Sciences, University
of Wisconsin - Green Bay
Place the cursor in the desired map quadrangle to read the name.
The numbering system works as follows:
- The first two digits are the longitude of an 8-degree zone, starting
with 01 for 48 to 56W and ending with 12 for 136 to 144 W. East longitude of
zone = 40+8*Zone index
- The third digit is for 4-degree latitude zones, starting with 1 for 44
to 48 N and ending with 9 for 76 to 80 N. South latitude of zone = 40+4*Zone
- North of 80N, 120 is used for longitude 56-72 W, 340 for 72-88W and 560
for 88-104W. 120 corresponds to longitude zones 10 and 20, and so on.
- South of latitude 68, blocks 2 degrees wide by one degree high are
lettered starting with A in the southeast and zigzagging to P in the
northeast. From north to south and west to east, the letters run M,N,O,P;
L,K,J,I; E,F,G,H, and D,C,B,A.
- From 68 to 80 N (second digit 7, 8, or 9), blocks 4 degrees wide by 1
degree high are lettered, zigzagging from A in the southeast to H in the
- Above 80 N, blocks 8 degrees wide by 1 degree high are lettered,
zigzagging from A in the southeast to H in the northeast.
Return to Professor Dutch's Home Page
Created 12 August 2003, Last Update
13 September 2018