Simplified trail maps that include the JPEG images don’t include all that you might need on a trail.
Contour lines, Scale and Legend are all integral parts of a topographic map.
You can get topographic maps from local government companies or specialty companies.
You have to look around to identify nearby locations or features including mountain, river, road, or spur if you have to locate those features to find your position on the map.
Landscape features include saddles, spurs, summits, and reentrants determined by contour line patterns on the topographical maps.