Click on Utilities PANS OPS and select VNAV_LNAV and VNAV, and the WIZARD appears. 

Wizard is very easy to fill in, just enter the necessary data.

The distances are referred to the THR.

You can select CAT A, B, C or D.

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If you click Finish in the wizard The output tell you, you must click on THR and Opposite THR.

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After thar you get the VNAV in the workspace, with the message and also with the parameters.

You can see the main parameters of VNAV in the output component 

If you select a plane from VNAV you can get the information about how that VNAV was built with the parameter and data input.

Click on

UTILITIES PANS OPS

OBSTACLE ANALYSIS

PANS OPS MAIN AREAS

Select

VNAV

and click next:

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the obstacle data wizard appears, you have to load obstacle data and click Finish.

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The output tell you select any plane from vnav with red circle and evaluation stars.

It takes less than 2 minutes to analysis 200 m size cell from DEM (2,000,000 points) or

up to 10 minutes for 05 m size cell from DME (80,000,000 points)

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You get the critical obstacle with a red circle (in layer criticalObstacles) in the drawing and also get the main data in output.

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You can move the vertex / insert vertex of the areas  to limit the area to analysis. Not CUT because information from VNAV is LOST.

Also you get in the file of the analysis of the first 5000 or 10000 critical obstacle.

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Including OCA estimation for all CATs.

As any area you can export that area to KML.

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First select all the oas area

then Click 

Basic Operation

Transform to KML

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And you get the KML in the folder of KML of the program

My Files / Documents / AirNavCAD / KML