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DeLorme Topo North America 9.0 User Guide
38
Notes
• UTM/UPS and MGRS coordinate systems are best used with NAD27 datum. 95% of
the USGS quads containing UTM grid lines uses the NAD27 datum, which is helpful if
you are comparing a map generated from your mapping application to a USGS map.
• If the USNG coordinate system is not matched with NAD83 datum, a warning
message displays (unless you selected the Do Not Show This Message Again option).
• If the UTM/UPS or MGRS coordinate system is mismatched to WGS84 datum, a
warning message displays (unless you selected the Do Not Show This Message Again
option).
• The State Plane Coordinate System originally used NAD27 datum and was measured
in statute miles. Some states have updated their systems to WGS84 datum and/or
kilometers. If you are working with a site map, verify the datum, distance measures,
and zone used and match them in your application.
To Change the Distance Preferences
Distance preferences affect how distance and areas display throughout the program.
Use the following steps to change the measurement units for distance and area.
1. Click the Options button
on the toolbar and then click Options.
2. Click the Display tab.
3. Select the measurement from the Measurements drop-down list.
• Statute Miles (statute feet are used for small distances)
• Kilometers (meters are used for small distances)
• Nautical Miles/Feet (statute feet are used for small distances)
• Nautical Miles/Meters (meters are used for small distances)
4. Click OK to commit the change and exit the Options dialog box.
OR
Click Apply to commit the change and keep working in the Options dialog box.
To Change the Bearing Preferences
Bearing listings are created as the result of creating route directions in the Route tab or
from an Advanced (Distance From) search in the Find tab. Bearing refers to the compass
direction of a given object measured clockwise in degrees (for example, 30°) or nearest
compass point (for example, NNE) and indicated from True North or Magnetic North.
Notes:
• Magnetic declination is the difference in degrees between True North and Magnetic
North at a specific location.
• The bearing setting does not affect map appearance.
Use the following steps to change the bearing.
1. Click the Options button
on the toolbar and then click Options.
2. Click the Display tab.
3. Select the bearing from the Bearing drop-down list.
• True North—The direction to the north pole. This is the default setting.
• Magnetic North—The direction that a compass needle points.