A bit of a warning to aĺl. My Phantom wasn't behaving as it should.. hooked up the assistant. Anyway, noticed that S1 worked properly between GPS and ATTI. A big however, the lighest touch on S1 in GPS moved it to ATTI on the assistant. Clicking it up and down moved it back to GPS, but the slighest touch moved it to ATTI again. I may send it back or just replace the switch with a quality item.