MARPLOT Software

On this sample map, the basemap is set to the standard view, which includes items such as roads, cities, lakes, and national parks. Overlay objects (a chemical facility and a hospital) have been drawn on top of the map, and a tricolored ALOHA threat Zone.

MARPLOT is the mapping program for the CAMEO software suite, which is used widely to plan for and respond to chemical emergencies.  Learn more about the CAMEO software suite.

MARPLOT allows you to add map objects on top of background basemaps (such as street maps or satellite images), as well as interacting with the map in other ways (such as getting population estimates within an area). MARPLOT can be run by itself as a general mapping program.  It can also be used interactively with programs in the CAMEO suite to link map objects to database records in CAMEOfm and to display ALOHA threat zone estimates on a map.

Downloading MARPLOT

The latest version of MARPLOT is only available as a Windows application, and it has been tested on XP, Vista, and Windows 7.  Macintosh users can use the Windows version of MARPLOT if they have virtualization software, or they can download an older MARPLOT Mac version.  A new version of MARPLOT that will run on both Windows and Macs is under development.

Note for MARPLOT 3.x Users: Read the instructions for upgrading to MARPLOT 4.x from a 3.x version.

Learning More About MARPLOT

For information about the file formats and import/export in MARPLOT 4.x, download the MARPLOT 4.x Technical Documentation.

For the full list of files that MARPLOT 4.x downloads, see the directory of MARPLOT 4.x download files

What is new in latest version of MARPLOT (4.2.5)?

  • Updated the URLs for several basemap layers, which are web mapping services (WMSs) provided by other organizations
  • Fixed the connection to the Get Elevation feature, which is also provided by a third-party organization
  • Made minor bug fixes and changes

Getting Help

You can report software bugs or obtain additional assistance by emailing the RMP Reporting Center (, or by calling the CAMEO help desk at (703) 227-7650 on weekdays from 8 AM to 4:30 PM, Eastern Time.

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