Excerpt: I recently purchased a Pharos Traveler model 505 GPS unit to help on a cross-country journey. I moved from Tampa,... I purchased a Meridian Marine two years ago. In the first season, the unit had an intermittent problem with the b... Specifics: Serial port connection to computer; 8mb flash; I use rechargable batteries); Not water proof, although it has been through some inclement weather and has been banged around and survived.