MGRS Graticule

ODIN provides a Military Grid Reference System (MGRS) coordinate grid overlay for the map. The grid is rendered as a vector layer and adapts its level of detail based on the current zoom level.

Enabling the MGRS Grid

1. Open the View menu
2. Select Graticules → MGRS

The MGRS grid overlay appears on the map. WGS84 and MGRS graticules are mutually exclusive — enabling one disables the other.

Grid Levels

The graticule renders three levels of detail based on the map resolution:

Level	Grid Spacing	Visible When	Content
Grid Zone Designation (GZD)	6° × 8°	Always	Zone boundaries and labels (e.g. 33U)
100 km Squares	100 km	Resolution ≤ ~1200 m/px	Grid lines and two-letter square identifiers (e.g. WP)
10 km Squares	10 km	Resolution ≤ ~120 m/px	Fine grid lines with numeric labels

About MGRS

MGRS is based on the Universal Transverse Mercator (UTM) projection. UTM divides the world into 60 zones (each 6° wide) and lettered latitude bands (each 8° tall, from 80°S to 84°N). Within each zone, locations are identified by 100 km square letters and numeric easting/northing offsets.

Example MGRS Coordinate

33U WP 12345 67890

• 33U — Grid Zone Designation (zone 33, band U)
• WP — 100 km square identifier
• 12345 67890 — Easting and northing within the square (1 m precision)

Styling

• GZD boundaries — Thicker stroke with zone labels at the centre of each visible zone
• 100 km grid lines — Medium stroke with square letter labels
• 10 km grid lines — Thin stroke with numeric labels
• All lines use a neutral colour to avoid interfering with map content

Limitations

• UTM special zones (Norway, Svalbard) use standard 6° boundaries
• Polar regions (UPS) are not supported
• Grid levels finer than 10 km (1 km, 100 m) are not yet available