To put OTC into GFO, use the
Optical Targeting Correction (OTC) for SH4 v1.5 version from CapnScurvy, but on top of GFO after you have finalized the GFO mod activation. GFO, as Webster states is basically the Stock game, with as many "fixes" as he could find at the time of building the mod, which is what gives it the name "Game Fixes Only"... Also, the radar should not randomly turn on and off, unless you have added incompatible mods to the install. The SJ radar will turn off when water washes over it. It will turn on when no waves wash over. So if you are on the surface, you have radar, usually full-time, unless you turn it off with the menu button. Once you submerge, it turns off, whether you have it turned off already, or if it's on. Therefore, when you surface again, it turns back on - always. You must turn it off again, if desired. The SD Air Search is similar in operation, except in the Stock game, you cannot turn it on and off. It is always on, unless water washes over it. Refer to the "SH4_Q-Ref_Card_Back.jpg" and "SH4_Q-Ref_Card_Front.jpg" files for most of the available key presses.