I use the Magellan cheap exployer(sp). I have approx 600 stake beds, no problems. I keep about 60 on a gps. Another thing I like about magellan is you can number your matts, and also give them a name. I keep a certain area of the lake on the same gps. Another area on a different one, and so on. Each area is named something different. For example one area might be named after different birds, thus the bird matts. cigerette matts, bible matts, state matts, tree matts, etc. Easier for me to remember a good matt I want to fish by a name than by a number