- Measuring distance
On a 1:50,000 scale map, 1 cm is equal to 500 m, while on a 1:200,000 scale
map, 1 cm is equal to 2 km. You will find it handy to learn to use the
length of your finger or some other object as a measure of distance on
such maps. And since road maps indicate in detail the distances between
cities, they are helpful as a guide to the actual distance of your planned
course.
- Reading direction
The top of a map is always north, and it is very important that you get
into the habit of always being able to verify your present location on
a map.
- Verifying present location
During your actual travel, maps make it relatively simple to verify your
location in places where you can rely on bus stops, addresses, and place
names, but you must also practice long and hard on being able to infer
your location from road bends, forks, and bridges when you are deep in
the hills or other such locations where there are a lack of obvious landmarks.
- Reading elevation
On a 1:50,000 scale map, you can calculate elevation from the measurement
standard indicated on the roads. You can also determine it from nearby
spot elevations and from triangulation points. Contour lines are drawn
using intermediate contours showing elevation in 20 m intervals and index
contours that use thicker lines to show elevation in 100 m intervals. On
road maps, you can calculate elevation from spot elevations and from triangulation
points.
- Reading gradient
An easy way to read the gradient is to figure that areas with contour lines
closely packed together are steeper and those with contour lines loosely
spaced are more level. You can get an accurate gradient reading by dividing
the gradient difference of two points by the distance between them.
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