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ExcaVision, The Machine Guidance & Control System from Ocala Instruments.

2d vs. 3d: 

> 2d systems allow you to measure height information relative to a local point or laser.

The Ocala 2d system can be upgraded to 3d via the iGrade software and is easy to move between machines.   

iGrade GPS - 3d

iGrade 3d systems add the GPS map location so you can measure against an engineering plan and/or create your own survey and as-builts.

Now the machine can take its own point, line and surface measurements to increase your profit and productivity.

Indicate vs. Automatic:

Indicate systems display measurement information on a lightbar or screen in the cab.  In-cab displays may also show Plan or Profile views depending on the machine.

Automatic systems control the machine hydraulics.  The iGrade automatic systems are currently in testing.