TwoTrails is a timber cruising and timber sales admin surveying package. It is maintained and developed by the Forest Management Service Center. Though it is specifically written for USDA forestry personal, it is freely available to anyone. Many of the program capabilities are shared below:

• Manages all surveying methods approved by USDA Forest Service Handbook, FSH 2409.12, Chapter 50, Area Determination.
• Real-time GPS surveys:
• GPS Walk (Breadcrumb)
• GPS Angle Point (Take5)
• Real-time surveys:
• Direction Distance Traversing
• Radial (example: Island Exclusions)
• Corridors (example: Hazard Tree)
• Combined use of multiple survey types:
• GPS surveys
• Digitized Information (Shape Files, KML/KMZ, GPX, CSV)
• Remote sensing information
• Create Grid (Sample) Point sand Navigate to them
• Exports:
• KMZ and GPX
• Project Status and Information
• CSV’s (Points, Polygons, Metadata, NMEA Information, etc..)
• Automatically calculates area-error for comparison with handbook standard