I know how you feel about the PRC-90, I like them also. When I left active duty, I gave mine to a CG AirAux pilot who put it to good use conducting Recon and SAR missions.

No offense intended, but it would be less complicated to place it on the shelf and update with new equipment. The USCG just announced that they will no longer monitor 121.5MHz . It will do no good for you if no one is listening for your emergency call outs.

Good Luck with dealing with some of the folks that exist in the various "consumer service" desks! I know what you are having to deal with!