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MARPLOT 4.2.1 is a Windows application that can be run on XP, Vista, or Windows 7.  Macintosh users can still run an older version of MARPLOT;  download the Mac version.

Existing MARPLOT users:

• MARPLOT 4.x users:  MARPLOT 4.2.1 requires 2010 TIGER files (county-level roads, rivers, etc.).  The installer will give you the option to delete any previously downloaded 2007 TIGER files.  If you install the program and map data to the same locations as your current MARPLOT, you will not need to transfer any data.  However, it is recommended that you make a backup copy of your MarplotMaps folder before running the installer.  After installation, use the Download Manager to download new 2010 TIGER files for counties of interest.  You may also want to select the "Check for Updates" option in the Help menu to see if other files (such as state census blocks) need to be updated.

• MARPLOT 3.x users:  If you're using a version of MARPLOT prior to version 4.0, you should follow the guide for updating to MARPLOT 4.x from a 3.x version of MARPLOT.  To retain your current MARPLOT maps and data, please read this document before installing MARPLOT 4.2.1.
  

Downloading MARPLOT version 4.2.1

Note:  The installer file comes with the MARPLOT program, a set of national basemap layers, and an extensive set of context-sensitive help screens (rather than a separate manual).

For technical information about file formats and import/export, download:
MARPLOT Technical Documentation (PDF) (56 pp, 281K)

Installing MARPLOT

Once you have downloaded the installation program, double-click the MARPLOT application file, then follow the directions you'll see on your screen.

Starting MARPLOT

To start MARPLOT, open the Start menu, then point to Programs, and then click MARPLOT.

What's New in MARPLOT Version 4.2?

• Updated to 2010 TIGER files (county-level roads, rivers, etc.). 
  
• Added an Unlock Overlay button to the Object Settings dialog.  You can now unlock the overlay (and modify the object settings) on the same dialog box for existing overlay objects; this feature is not available when you are creating new overlay objects.
• Moved Overlay Manager and Overlay Maps from View menu to Overlays menu.
• Modified MARPLOT Import/Export feature so that it now properly handles the symbol numbers for Font Set 2.
• Fixed bug in version 4.1.2 where the shortcut keys (e.g., Ctrl+P) were broken.
• Removed QuickTime requirement. You can now run MARPLOT without installing QuickTime.  However, if you have QuickTime installed too, you will have more file type options for picture objects.
• Improved print drawing order.
• Other minor bug fixes.

What's New in MARPLOT Version 4.2.1?

• Fixed a problem with the "Go To Address" function
• Minor fix for the ALOHA threat zone export to KML
• Added capability to import HotSpot plume
• New state-plane map projections added.

Directory of MARPLOT download files