| Viewing Distance | Symbol Size |
|---|---|
| 3-6 m | 40 mm |
| 6-9 m | 60 mm |
| 9-12 m | 80 mm |
| 12-15 m | 100 mm |
| 15-18 m | 120 mm |
| 18-24 m | 160 mm |
| 24-30 m | 200 mm |
| 30-36 m | 240 mm |
| 36-48 m | 320 mm |
| 48-60 m | 400 mm |
| 60-72 m | 480 mm |
| 72-90 m | 600 mm |
Note : The symbol sizes are actual for any square symbol, but nominal for symboles using a circular or triangular shape.