What do you mean when you say the schedule is likely to change at any time?

The weather in Antarctica changes constantly. 

Changes in weather and wind can move sea ice and ice bergs into our path, and wildlife opportunities almost always arise unexpectedly, making our itinerary a dynamic one! 

As a result, while an expedition itinerary is planned ahead of time, it may change slightly or greatly due to the conditions at that time. 

All changes are communicated to you in an efficient manner, during briefings or announcements on the ship’s PA system.