Please add a timer of some sort to the gate map so we can tell when a gate change is coming.
The time doesn't necessarily need to be exact minutes and seconds but could be "arbitrary" units - just something so that we can estimate how long until a gate changes. It's an easy fix that I believe many players would greatly appreciate.
That would be convenient, but I kind of suspect they want it to be obscure (most of the game mechanics are). If it helps, the level change time always seems to be the same for a given gate at a given depth, so if you time it once, you can predict it (to an extent) on future trips. See this thread.