GPS

I bought this with a Magellan sportrak pro GPS unit. I already knew about the connector being shared with the data port, but since I don't have a laptop, I didn't want to waste the extra money to get the dual cable.
This item does exactly what it is supposed to. It works great on long drives when I don't have to worry about draining the batteries down to a point where I can't use the GPS unit at the destination. Attaching and detaching the connector using the D-rings is a little more involved than something that can just be plugged into the GPS, but obviously, making the GPS submersible involved compromises like this. I can live with that.

This power adapter does the job. It's neat because it can handle a wide range of voltage inputs. It has a small in-line power box that adjusts the input to fit the needs of the Meridian. The problem I had is that I bought it before realizing the power and the computer connection both use the same strange I/O connector. So if you use this adapter, you can't connect to your laptop. The solution is to buy the more expensive dual cable version that has both battery cord and serial cable attached.
-P-

I'm also a Geocacher, and I have to say this is a great product! I've been wasting money on rechargable batteries, but now I don't even have to worry about batteries at all. Good for long trips, too; because you don't even have to have batteries at all. A must-have for anyone owning a Meridian GPSr!