Hey Qiao,
It is my understanding that you want to add more than 1 label to the points plotted using 'plotPosition'. You can use the 'text' function to add textual description to data points. You can set the 'geoplayer' object axes as the axes to plot on and pass lattitude and longitude values of the points followed by the text/label you want to add.
You can refer the following code snippet:
data = load('geoRoute.mat');
player = geoplayer(data.latitude(1),data.longitude(1),12);
plotRoute(player,data.latitude,data.longitude);
plotPosition(player,data.latitude(1),data.longitude(1));
text(player.Axes, data.latitude(1),data.longitude(1), "LABEL", 'Color','red','FontSize',7);
Hope this helps!
