I am fairly new to HPR. What altimeter boards/dual deployment boards everyone uses and why? To clarify I am not interested in a strict comparison of features but in individual reasons for why people use the altimeters they do. I personally have been using the Raven3 altimeter because of the extensive data logging capability and because the friend that introduced me to HPR recommended it. It has worked well but is expensive. I am also interested in finding or making an open source altimeter board that has open source software because I am interested in playing around with altimeter software. Does anyone know of an open source altimeter board? Thanks for any help or information you can provide.