The NAVSHIPS manual is on BAMA. It is NAVSHIPS-0967-187-5010.PDF. This is for the -C, -D, and -G models. If you can't get beyond 30%, as written on page 1-1 and others, it may be time for a poke inside. I just had to replace the tubs for the XTAL Osc. in mine. I am fortunate in that it is only off by 100 - 125 cps. Everything else is fine. -- Bob - NØDGN