Silva ALPHA 4 Manual do Utilizador descarregar pdf (Página 49)

NAVIGATION

Understanding Map Features

Being able to visualize the terrain de-

picted on a topographic map is key to

both planning and travel. Contour li-

nes represent the topography or “ver-

tical” shape of the landscape, helping

identify features like mountains, val-

leys and ridges; the closer the lines,

the steeper the slope. Topographic

maps are also colour-coded: blue for

water; white for open terrain, green

for forest; black for roads, paths, buil-

dings and other manmade objects.

Navigating Safely

Both when planning and traveling, use

significant terrain objects to mark your

route. Examples include rivers and lakes,

hills, fields, paths, roads and power lines.

By holding onto this visual “hand-rail” you

travel faster and more safely, reducing

the number of possible route-finding er-

rors.

Understanding Scales / Distances

A map is a scaled down model of reality, so

it’s important to understand how it repre-

sents distance. Using the map’s scale,

you can measure distance with the com-

pass base plate. If your compass lacks

the corresponding scale, use the regular

metric ruler and this simple rule: drop the

last three digits from the scale and this

is the number of metres on the ground

represented by 1mm on the map; e.g,

on a 1:50.000 map, 1mm represents 50

metres. (NOTE: special map measurers

also work with most map scales to make

distance measurement easy.)

Hints & Tips

Fotograf: Peter Holgersson

Olle Boström, Silva ambassador and bronze medalist at World championship in France 2011, using Silva 6 Jet spectra.

Silva WB 2012.indb 49 2011-09-19 15:29

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Silva ALPHA 4 Manual do Utilizador Página 49