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TMS VCL WebGMaps
Creating moving markers on WebGMaps

After a marker has been added with the method WebGMaps.Markers.Add(), it can be moved at a later time on the map by simply changing its longitude and/or latitude properties.

Example:

Button1 adds a marker on the center of the map. 

procedure TForm3.Button1Click(Sender: TObject);
begin
  webgmaps1.Markers.Add(webgmaps1.MapOptions.DefaultLatitude,webgmaps1.MapOptions.DefaultLongitude);
end;

From button2, you can make the marker move in latitude direction with following code:

procedure TForm3.Button2Click(Sender: TObject);
begin
  webgmaps1.Markers.BeginUpdate;
  webgmaps1.Markers[0].Latitude :=  webgmaps1.Markers[0].Latitude +0.01;
  webgmaps1.Markers.EndUpdate;
end;