Answer:
The starting altitude can be calculated by subtracting the gain in altitude from the current altitude.
Starting altitude = current altitude - gain in altitude
Starting altitude = 285 feet - 296 feet
Starting altitude = -11 feet
Based on this calculation, it seems that their starting altitude was below sea level, which does not make sense. However, since there is no record of their starting altitude, it is possible that there was an error in the watch or that the hike leader did not reset the watch to zero at the starting point.
Explanation: