The dim: parameter defines the diameter of a viewing circle centered on the coordinate. While the default unit of measurement is metres, the km suffix may be appended to indicate kilometres.

GeoHack uses dim: to select a map scale such that the viewing circle appears roughly 10 सेंटीमीटर (4 इंच) in diameter on a 72 dpi computer monitor. If no dim:, type:, or scale: parameters are provided, GeoHack uses its default viewing circle of 30 किलोमीटर (19 मील).

Samples
Subject View diameter Markup Result
Western Hemisphere 10,000 किलोमीटर (6,200 मील) {{coord|0|N|90|W|dim:10000km}} 0°N 90°W / 0°N 90°W / 0; -90
Ohio 400 किलोमीटर (250 मील) {{coord|40.5|-82.5|dim:400km}} 40°30′N 82°30′W / 40.5°N 82.5°W / 40.5; -82.5
Dresden 20,000 मीटर (12 मील) {{coord|51.03|13.73|dim:20000}} 51°02′N 13°44′E / 51.03°N 13.73°E / 51.03; 13.73
Statue of Liberty 100 मीटर (330 फीट) {{coord|40.6892|-74.0445|dim:100}} 40°41′21″N 74°02′40″W / 40.6892°N 74.0445°W / 40.6892; -74.0445