Animation of moving vehicle location on image

Hello,

I am trying to animate a vehilce as it changes location (lat, lon, alt) on a map image.

%display map image drapped over elevation data

figure('Renderer', 'opengl');

usamap(latLim, lonLim);

geoshow(double(Z), R, 'DisplayType', 'surface', 'CData', orthoImage);

daspectm('m', 1);

axis vis3d;

v1_handle = plot3m(vehicle_1(1,2), vehicle_1(1,3), vehicle_1(1,4), 'b.', 'EraseMode','xor');

for i =1:length(vehicle_1(:,2))
  set(v1_handle, 'XData', vehicle_1(i,2), ...
      'YData', vehicle_1(i,3), ...
      'ZData', vehicle_1(i,4))

    drawnow
end

The image and elevation data display fine, however, after the initial position is displayed in the figure, it doesn't update on the image even though the X/Y/ZData from the v1_handle is updaiting.