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That being said, there are a few products out there that do some/most of what you're offering.
First, there's the Raymarine's LifeTag MOB base station/bracelet system:
Raymarine Marine Electronics - LifeTag
These run about $800 street price with 4 crew bracelts. They will sound an alert and alarm if a crew member goes more than a certain distance from the base station (assuming a distance overboard). If its on the Raymarine network along with your Raymarine chartplotter, it will also key in your Man Overboard waypoint (MOB). The weakness of this product is that its only an "alert" mechanism. Other than laying a breadcrumb trail back to where a person potentially sounded the MOB alarm (either automatic or triggered), it wont help you FIND the crew that went overboard.
While I cant find it online right now, there used to be a PLB/base station combination that operated on the last generation EPIRB frequency that allowed someone with a base station/search and rescue kit to "track" where a person with a 243 Mhz PLB was in the water. I haven't seen such a package with this generations EPIRB/PLB devices. I guess the thought is just punch the device and wait for the Coasties to get you. Cold comfort for ocean crossers among us, as that will likely be a body recovery exercise rather than a rescue.
So I guess the full package of what you'd be offering would be a combination MOB pendent (ala raymarine) with the trackdown capability of teh Search and Rescue base station along with a last gen PLB. Seems like a lot to wear, I'd be interested in your offering if it can do that all in one and is viable for search off the boat one falls off of (ie, interfaces with an autopilot to turn the boat to track to where the distress beacon is coming from)