Last trip out to the Deer Group I noticed my GPS ( Garmin GPS 60 CSx) displayed a rather amateur looking screen that showed I was not anywhere near where I knew I was. No matter what I did Helby Island and the Ross Islets did not appear on the screen. My way points appeared on the map but not the land masses I was familiar with. Perturbed, I was able to paddle, using chart and compass, unable to figure out why my device was displayed a map drawn by an amateur cartoonist rather than the usual place names, navigational aids and depths/ detail so helpful when trolling for salmon. At home I rinsed off my electronics with warm soapy tap water and allowed them to dry overnight. I have followed this procedure since I started paddling. When I removed the back of the GPS, took out the batteries, I discovered that the little SD card I installed four years ago was missing. After a thorough search of my vacuum cleaner, the room I store my kayak gear in I was unable to find the card anywhere. Since I always start each trip with new batteries installed at home, I am at a loss as to where this item was lost. At a replacement cost of $200.00 I thought it a good idea to advise other paddlers to apply a piece of tape across the stainless steel card holder or at least ensure it is locked in place each time. And if anyone has a replacement sitting on their shelf gathering dust I would be happy to negotiate on its liberation.