I’m not sure that map reading is a single skill to be measured. There are different ways to use maps.
I don’t read a city street map the same way I would a topo map. These are two extremes of what I would call the “orienteering view” and “network view” of the maps, I guess. The latter only applies to maps that have a network of paths of some sort marked on them - highway / street maps, building corridor maps, maps of marked trails dispensed at trailheads, etc.
The “network view”, which I use pretty much exclusively when using a street map to navigate is the sort of reasoning you use when presented with something like:
A
|
X|
| Y
|---------
|
|
B
OK, if I’m on street Y approaching road X, I turn right if I want to go direction A, left to go direction B. Or, if parked on road X at the corner of Y street looking at the map, I’m headed towards B if Y is on my left, towards A if it is on my right. You also obtain your direction by the order of cross streets to the one you’re on, etc. You aren’t orienting the map to the actual territory, you’re just using it to illustrate a network of paths which you are negotiating, and attaching a small amount of ancillary data such as how long the network edges are, which streets are major through streets, which are one way and so on. In threads like the auto compass thread, or discussions of using maps here, it leads me to say “Again with the damned compass directions!”. If I’m using a map this way, that doesn’t matter much. What matters is getting my placement and direction on the network right, and translating where I desire to go into a series of path names and turns.
The “orienteering view” of a map is different. Here, you DO orient the map to a landscape, and compass directions do matter. You are using the map to visualize the topography - OK, let’s see, that pond over there must be this one …
One might use a hybrid of the two views, and there are probably others besides. For instance, that map you got at the trailhead lets you plan a hike on the marked trails exclusively viewing the trails as a network with a bit of ancillary data such as how steep the trails are, etc. You may wish to orient the thing to identify distant peaks and so on, though. I’m not sure that proficiency at using the map one way implies proficiency at the other.