Bill- It was a kind offer which , even at 13 yrs old, might be snapped up on a different venue, but if it comes to the point where you would toss it, why not see if you can delete the data and perhaps eventually use it for a spare memory card? When offering it might help to mention what type card it is. ( CF , SD. mSD, etc....).
If you have a newer chartplotter, you might also be able to use it as a trade in against part of the cost of the new chart card you would use.
That said, I think Navionics for instance cancelled their trade-in program a few years back.