The maps also show certain "features" such as huts,campgrounds,parking lots and passes. Each of these types of feature have their own custom icon. Below is a list:
Huts - a brown hut symbol on a white background
Campground - A "tent" symbol on a white background
Parking Lot - A blue "P" on a white background
Passes - Two blue vertical lines
You should see a blue "P" at the trailhead at the south end of Callaghan Lake.