I remember some mod with a cam in it that hosed my hydrophone station...but at this time in the morning I have forgotten which one. Suffice to say it went into the dumpster.
I never played stock 1.5 as it became a test bed for some other endeavours. Currently have three installs of 1.5 and you can "mouse" the hydrophone all you want. If your install is heavily modded suspect a "camera"; if not then someone else will chime in that has a stock install of 1.5.
Hope you get it sorted, the keys work well but I do prefer the mouse especially in a convoy situation.
Happy Hunting!
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