( 3) Usually an arrow points north, allowing you to get oriented [gl 19]. ( 4) Often the maps are colored to indicate the general elevations [gl 12].
( ৪) সাধাৰণতে সমূদ্ৰপৃষ্ঠৰ পৰা ঠাইবোৰৰ উচ্চতা বুজাবলৈ মেপবোৰক ৰঙীন কৰা হৈছে [১২] ।