Global Mapper v25.0

What is GM Elevation Grid native file format

imagecatcher
imagecatcher Global Mapper User
What is GM Elevation Grid native file format?
I inadvertently unloaded numerous merged grided elevations. To avoid this in future, what file type should I export this out as so that it can import again looking the same (heatmap)? As opposed to a 3d DxF or point file.
Thanks

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