Which of the following is NOT a basic compass design model?

Front reading is not considered a basic compass design model. Basic compass designs generally include liquid-filled compasses, which utilize a liquid for stability and ease of reading, and baseplate compasses, which feature a flat base that can be used for navigation and map reading. Back reading refers to a method of reading the compass from behind the bezel to determine the heading opposite to the one indicated.

Front reading compasses, while they do exist, are not one of the fundamental types that are widely referenced in basic compass design discussions. Understanding compass design is crucial for navigation as it influences how divers orient themselves underwater and accurately follow their planned routes.