It is energy and motion, it can fly across the ocean.
It can listen and even speak, it can see and even seek.
It eats neither fruit nor gruel, it eats energy and fuel.
Better say: It doesn't eat; It is transformed into heat.
What is it?
My first letter is in sea but not in ocean,
The second is in change but not in motion.
My third letter in boat but never in ship,
And the fourth is in travel as well as in trip.
The fifth letter is in dark but not in caves,
And my whole is a triangle popping up from the waves.
What am I?