Add Scanned Map Command

Before you can use your map in ExpertGPS, it must be added to the Map Library and calibrated.

Adding a New Scanned Map

To add a new map to the Scanned Map Library, click Add and Calibrate a New Scanned Map on the Map menu, under Scanned Paper Maps and Digital Charts.

The Open Scanned Map dialog will appear. Select a JPEG, TIFF, PNG, or Bitmap image of your map.

Open Scanned Map dialog

The Edit Scanned Map Dialog

In the Edit Scanned Map dialog, enter a descriptive name for your map, and specify the projection information located on the collar of your map. If your scanned map came with a calibration file (worldfile or map calibration file), it will automatically be detected and used. Otherwise, you will need to manually calibrate the map so that your GPS data appears correctly on it.

Edit Scanned Map dialog
Name
Enter a name for this map.
Projection
Select the projection that this map uses. This information should be printed on the margin of the map.
Projection Parameters
Datum
Select the datum used on the map.
Parameters
If the Parameters button appears, ExpertGPS requires additional information about the map projection. Click the Parameters button and enter the projection details for the map.

Map Projections and Parameters

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.

Albers Projection Parameters Albers Equal-Area Conic Projection Parameters dialog

Standard Parallels

Enter the latitude of the two standard parallels, in degrees and decimal minutes.

Lambert Conformal Conic Projection Parameters

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.

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.

Tip:
If the Central Meridian is not explicitly listed in the map margin, determine the line of longitude that is vertical on the map. In the example below, the 0º and 20º East lines of longitude slope away from the vertical at the same angle. Therefore, the vertical Central Meridian lies halfway between them, at 10º East.
Determining the Central Meridian

Origin Latitude

Enter the latitude of the natural origin of the map.

False Easting

Enter the false easting used by this projection.

False Northing

Enter the false northing used by this projection.

Scale Factor

Enter the scale factor at the natural origin of the map.

ExpertGPS is mapping and file conversion software for your Garmin GPS ExpertGPS is mapping and file conversion software for your Magellan GPS ExpertGPS is mapping and file conversion software for your Lowrance GPS
ExpertGPS works with hundreds of GPS receivers, including all Garmin Drive, nĂ¼vi, eTrex, Colorado, Dakota, echoMAP, GPSMAP, Edge, Forerunner, Montana, Oregon, and Rino models, Magellan eXplorist, Meridian, and SporTrak GPS receivers, and Lowrance iFinder, HDS, Elite, HOOK, LCX, and LMS GPS chartplotters and fishfinders.
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