In order for your scanned map to display correctly, ExpertGPS needs to know the details of the projection used when the map was printed. This information should be printed in the margin or a corner of your map.
- Standard Parallels
- Enter the latitude of the two standard parallels, in degrees and decimal minutes.
- Central Meridian
- Enter the longitude of the central meridian. This is the only line of longitude on the map that is vertical. All other meridians are at an angle.
Tips
- The standard parallels for maps showing all 50 US states are typically 20º and 60º North.
- The standard parallels for maps showing the 48 conterminous US states are typically 29º 30' and 45º 30' North.
