For mapping with a narrow field of view, you want a lens that narrows what you capture, which typically means using a longer focal length. Lenses labeled as wide or super wide are designed to cover broader scenes and therefore produce FOVs larger than 75 degrees. A normal angle lens sits in the middle but still doesn’t target the particularly narrow framing you’re after. The single lens option represents a fixed focal length setup that yields a tighter frame, making it the best fit when you need a narrow field of view under 75 degrees.

The key idea is knowing which form of a map is prepared so an engraver can directly transfer it to a printing plate. A guide copy is a complete, corrected version of the map that includes every element exactly as it should appear in print—lines, symbols, lettering, scale, legend, title, margins, and all layout details. This is the form that can be handed to an engraver and used to create the printing plates with fidelity. Other options aren’t suitable for engraving in this context. An isometric diagram is a 3D-like representation used for illustrating a concept, not the full map ready for printing. Vinylite is a material or substrate, not a map itself. Globe gore refers to the individual gores of a globe and does not provide a single, print-ready map layout for engraving.

Navigational mapping is about precision for moving through space in real-time, so the map type used for air or sea travel is designed with explicit navigation information like routes, bearings, scales, and symbols for hazards and aids to navigation. A chart serves this purpose precisely, providing the detailed, standardized data mariners and pilots rely on to determine position, plan courses, and avoid dangers. The other map types desk different tasks: hypsometric maps focus on elevation and relief, lithofacies maps show rock types and depositional environments, and chorographic maps depict the distribution of features across a region but aren’t tailored for navigation. Therefore, for navigating in air or water, a chart is the appropriate choice.

Two perpendicular, regularly spaced line sets form a grid, which gives the map a simple coordinate reference system. This grid creates a regular network of lines that you can use to locate points by where the lines cross from each direction. Isopleths are contour lines that connect points of equal value, so they describe elevation or other quantities rather than a regular crosshatch reference system. Focal length is a camera or lens term and doesn’t describe map line patterns. A symbol is just a graphical representation for features, not the network of lines itself.