Standard Grid System
Vicmap Topographic Mapping 1:25 000, 1:30 000, 1:50 000 and 1:100 000 mapsheets are all interlinked spatially and by a numbering convention.
The links between the various scales are shown below for 1:50 000 to 1:30 000 A4.
and below for 1:100 000, 1:50 000 and 1:25 000
All mapsheets are created using MGA (Map Grid of Australia) coordinates and are aligned to Grid North for the relevant zone. Zone 54 is longitude 138° to 144°, and zone 55 is longitude 144° to 150°. To convert a bearing calculated from the map to a magnetic bearing (as shown on a compass) requires a correction for the magnetic declination. Each map shows the value of Grid Convergence and Magnetic Declination calculated for the centre of the map.