For what it's worth, I have had a DL InReach velcroed to a bulkhead
inside my cabin and it has been sending automatic position reports for the last 4 months every 4 hours when the boat isn't underway, and every 10 minutes when my SOG is over 2 knots. It hasn't yet missed a single position report from inside the cabin. It is kept charged through a 5 volt switching regulator that draws 0.1 amp from the boat's 12 volt supply. You can buy chargers that are a little less efficient for $10 at Radio Shack.
I plan on entering the race. I'm just waiting for the inspection results on my 53 year old Ariel, and overcoming my own reticence to drill 40 holes in my balsa cored deck - over which I will cry many tears - to install clothesline (lifeline) stanchions. I'm still looking for stanchion bases that I can attach to the hull instead that won't act like little sea anchors when she's heeled with her rail in the water (a normal underway attitude for my boat).
I always carry a PLB in a fannypack when I'm out. It never gets in the way and it seems like a good precaution. I have a strip of "supervelcro" on the top of my helmet to which I'd slap the PLB (if I'm bobbing in the water I won't be too fashion conscious) - I learned that trick from the Coasties. Besides the obvious need if you go overboard - you may not find the EPIRB among all the flotsam if you abandon after it gets kicked out of its holder. I suppose most of us wouldn't step into the liferaft until the last inch of the rail sinks below the surface. By then, the EPIRB may have drifted away. And having an active PLB in addition to an active EPIRB does say rather emphatically: "Yes, I really mean it. I'm in trouble here."
I don't want to debate over whether PLBs should be required. IMHO, it's a matter of personal choice and personal risk assessment (as should be lifelines).
However, I think the requirement to check in might prevent an unnecessary SAR mission if you're out there drifting around looking like your vessel is NUC ("not under command"). With the DL, I can send a text message saying: "I'm becalmed/beset by weather and hove to with a sea anchor" or whatever. The YB won't let me say that "I'm OK - my radio is dead but don't worry about me." If the Coasties show up way out at sea, they may order you off your boat so they don't have to come out again. You can read an account of that happening from the story of
S/V Satori (the actual rescue depicted in
The Perfect Storm). Being able to say: "I'm OK," may save you from being forcibly evicted from your vessel (and the taxpayers a load of cash).
The SPOT trackers will quit working about half way to Hawaii. Hawaii is outside their satellite footprint. SPOT is delusionally optimistic showing degraded service all the way to Hawaii.
I've looked at the YB depiction of the 2012 Transpac, and it's very nicely done. I personally have no problem with carrying both the DL and the YB just to get the nice record of the voyage.