🔍 Key Concepts

• Ship construction/drawing symbols used on naval architecture plans • How amidships is marked relative to the bow and stern on a profile or sheer plan • Difference between symbols for centerline, perpendiculars, and midship section

💭 Think About

• Look at each symbol and think which one could logically represent the middle of the ship between forward and aft • Ask yourself which symbols look more like they mark a reference section along the ship’s length, instead of things like centerline or baseline • Consider how a naval architect might draw a special mark at the midship section that must be easy to spot on a plan

✅ Before You Answer

• Be sure you can explain to yourself what each of the other symbols likely represents (for example centerline, baseline, or twin-screw propellers) so you can eliminate them • Confirm that the symbol you choose could reasonably be used on a longitudinal profile to mark a single station halfway between FP and AP • Before deciding, re-check that the symbol you pick is not commonly used for the centerline on plan views or for propellers on arrangement drawings