Lowrance Airmap 2000c Aviation GPS

I am unot/u selling this item here. The GPS unit is collecting
dust in my closet. It was purchased in March 2005 and was only
briefly used (Got divorced. Can no longer afford to fly). Now that I
am getting ready to sell it, apparently there is a "terrain update"
that it needs in order for someone else to want to buy it. The
Lowrance web site has a pdf download, but it does not tell me how to
get the update or what it will cost. Can someone please advise?

And just to make this post more useful. I love this GPS unit. In my
opinion, GPS is the best improvement to the flying experience since
the invention of the propeller. And Lowrance has a great aviation
GPS.

Posted replies appreciated. Thank you.