GPS for Open Water Swimming

Has anyone else used a GPS for Open Water swimming? I got a ADEO audio GPS and was able to use this to get some good results on our practice swim in this past spring. Here is a link from our team's website www.cmym.us/.../index.cfm. This is a nice GPS for swimmers in that it is audio only and I was able to find a case that fit on my google straps. The real problem with the product is that most of the prompts are for runners so the pace is in miles/hour and not meters/sec or yard/sec. I used this GPS for more a post swim analysis of our swims, as we swim in a groups and wait for the slower members at some marked locations. This GPS was also nice for skiing where I usually listen to my MP3 player I just routed the cord to the GPS and then my headphones and had a back seat driver all day.