I've read a lot about compass issues when taking off or calibrating around metal objects. I want to fly in the area pictured below to get some pictures of the Gas tanks before they are demolished (to make room for a shopping mall. I know they are made of concrete & metal so my question is, am I looking for compass trouble or should i be ok as long as I'm not taking off from them? I would be taking off from about where the picture was taken so range is not an issue. I see videos of people chasing cruise ships so i want to think this should be fine but don't want to assume anything.