Yes, I did, and a couple of other boating mags too over the past few months. Then I did a Google search, and found a gadget review site that also did a review on it. They were not so happy with it. Can't remember all the details, but do recall it took close to 10 mins to find the satalites. A fact mentioned briefly in Powerboat.
I'm researching PDA's now, and am discovering there are other GPS/PDA combos abailable that don't get the advertising of the NAV MAN. No idea how good they are yet.