You might want to consider the Garmin 76S, too.
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Both the 76S and 60CSX have built in barometers and both are water resistant.

With regards to water depth. I don't know of a handheld GPS unit that has a depth finder. The console units have depth finders, but you have to install a transducer on your kayak.

Unless you are kayaking along the coast or in the Great Lakes, the Blue Chart software won't do you any good. The software is great, but it's coverage area is limited to navagible waters. Rule of thumb - if you can't get a NOAA chart for where you want to fish/kayak, then the Blue Chart won't have the coverage either.

If you are going to invest in a GPS, I recommend you invest a little money and get a good quality unit. Garmin makes excellent products. Garmin units support the GPX format which allows you to post and share data via the internet.