You can add custom markers to GMap by placing the marker images in the markers/ directory, and configuring the marker with an ini file. You may wish to make your own folder to keep your markers seperate from the built-in markers.
An ini file:
; Defaults
[defaults] ; The defaults section holds the settings that will be used if they are not specified on the marker.
;shadow = "" ; The filename of the image to use for the "shadow" of the marker.
anchorX = 10 ; anchorX and anchorY are the pixel coordinates relative to the top left corner of the image
anchorY = 29 ; to define where the "pushpin" of the marker is.
infoX = 17 ; infoX and infoY are the pixel coordinates relative to the top left corner of the image
infoY = 6 ; to define where the "tail" of a popped-up info window points to.
; Marker sets
[mycustom] ; This is the "internal" name of the new marker type. It's used
; in macros and when placing markers using PHP code.
name = "My custom" ; This is the name that appears in the marker chooser dropdown.
sequence = "my1.png,my2.png" ; The list of image files to use. Specifying multiple filenames
; will let you have changing images when placing a series
; of markers. The "Numbers" marker is a good example.
; Files
After creating your .ini file, be sure to go to the GMap settings page and click the Regenerate button.
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GMap uses a custom event system to pass data and events around.
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