I am working on getting my private right now and rent a Cessna 150. I am just thinking about possible long distance trips I could take in the future after getting my license. I have a handheld GPS unit, garmin etrex, that I use for things like hunting. My question is whether or not its okay to use this unit ( for a supplemental naviagation) while flying the 150? I don't see why it wouldn't be, but just thought I would make sure.