This half of MaxSpeed issue with the manual use of the Hydrophone is not nearly as big a problem for those playing the "stock" game as those that have modded their game.......especially a mod that's modified the Single Mission or Campaign Mission files.
By and large, the stock game has many (if not most) of their ship speeds higher than half MaxSpeed between waypoints in its .mis files. So, you're more likely to not have this problem.
A mod like RSRDC that added hundreds of additional waypoints to its shipping routes, with
many changes in ship speed between different waypoints, will have this issue regularly.
Jazzy, something you might consider when posting a question:
What mods, if any, are you using? And, in what order are they in "Activation" within JSGME? That always helps diagnose an issue.
