I have to agree with Doug on this one. I gave a couple of PLBs to boaters that needed them with specific directions that they would need to replace the battery soon. Replacing the battery was a do-able expense for someone who had never owned one before and was unaware of the smaller size, expanded capability units. I found out that de-registering a PLB was quite easy. And if you give one away, you definitely want to do that. Similarly, if you loan your PLB out, be sure you have sufficient information from the borrower to attempt to make contact them if it is activated and you receive a call from the authorities.