The Mobile Portal for the Hammerhead is a really cool module, but due to its nature, it is very hard to use effectively.
When you first activate it, it drops an inactive portal where you were. Then once you activate it again (within 5,000m) it drops another and links them for instant travel.
However, if you are to fly beyond the 5km range of the module, it resets and you must fly back to where you wanted the first portal to be.
This should be changed, so that once you reach maximum distantce, it automatically drops the second portal and begins cooldown.