Brent, Check the settings on your Raven. The Raven allows you to set the rate at which it will send out data. I believe this defaults to 2 or 3 seconds. If it's sending at 2 or 3 seconds and you've got Site Mate to record at 2 seconds, there will be times that Site Mate looks for a rate is unable to find one. We enter a -1 there just so that the position is still mapped and you get a coverage map on the screen in Site Mate. If you change the Raven to output to every 1 second and leave Site Mate at 2 seconds, you should get a much better map.