I mostly fly GPS mode but I've switched to atti mode in flight a few times before just to check it out. I have hardly any flight time in atti mode compared to GPS. I have more than 50 flights with my P 2. Here's my question, recently I was in a canyon with high rock walls. It was impossible to get 7 SATs locked. It would bounce around between 5-6. Since I've done no startups in atti I wasn't clear on a good start sequence. Is it just waiting for solid yellow instead of green at power on? Since I'll be flying somewhat close to canyon rock walls how much drift will I expect? HL will work normally if I flip that switch on in Atti mode right? Or does HL not work like RTH since there was no GPS lock at start. I'm assuming HL doesn't work in atti. Thanks for taking the time to read and comment. I may head back to that location on Sunday.