You start at 380 m above sea level. During a ride, your elevation changes by: +540 m, −268 m, +116 m, −152 m, +490 m, −844 m, +94 m. What is your final elevation relative to sea level?
356 m
Running sum: 380→920→652→768→616→1106→262→356. Final elevation = 356 m.