Science Buddies: "Ask an Expert"

Can anyone suggest the brand and model of GPS that can be used for this project? We should be able to turn on and off the WAAS capability of the GPS. We have a TomTom Start handheld model of GPS and I am unable to find out the WAAS turn off/on button on this GPS.
Thanks!

Hello. Please only ask your questions in a single thread so that our experts can best help you based on what has already been discussed. Please refer to your post in the Life Sciences section. Good luck, and thanks for using Science Buddies!