The Custom Symbols section allows users to create new symbols from their own bitmap and icon files which they can then use as the symbol to display for a given type. Custom symbols will also be available for layer or point specific symbol options.
Use this button to add a new symbol from an image file. This includes support for transparent symbols from PNG, ICO, GIF, and 32-bit alpha BMP files, as well as symbols from JPG images. You can also add vector symbols from EMF, DXF and GM_SYM (Global Mapper Symbol) files. Vector symbols will scale much more cleanly than symbols based on images
GM_SYM file format — Custom symbols can be defined as vector symbols using the GM_SYM file format. GM_SYM files are simply ASCII text files that the File ->Open Generic ASCII Data File menu command could load, with 0,0 being the center of the symbol and the coordinates specified as pixels, with X increasing to the right and Y increasing down to the bottom of the symbol.
For more information on the parameters or attributes to define a custom symbol, see ASCII Field Options
This button will remove the selected custom symbol.
To add a new custom model click this button and select the 3D Model file that you would like to use as a 3D Point Symbol. Global Mapper supports common 3D file formats for point styles such as OBJ, sketchup, DAE, and STL.
Once selected enter a model description. The new model will now appear in the 3D Model drop-down list. For more information on 3D point symbols see Working with 3D Models.
This button will remove the selected custom model.