The four basic elements required in a map are:
(a) Areas will be shown correctly.
(b) Bearing measurement anywhere on the reduced earth will be identical to the measurement on the earth.
(c) Shapes will be correct.
(d) Distances will be measured accurately by use of a graduated scale which is provided at the bottom of each map.
The distances are given in
(i) Kilometers
(ii) Nautical miles.
(iii) Statute miles.
