Being on a tight budget with my ST, I'm trying to make do with what I have for the up coming riding season. I got lucky and picked up a used blue tooth for my helmet and I want to use my I phone as a GPS. where I travel my I phone looses signal regularly( Mountains and Foothills) . My question is does a I phone 6 needs constant signal to navigate or once I use " Google maps " does it keep the entire track to my destination? Also any suggestion for a reasonable weather case mount for my I phone 6?. I have plans to add a fuse block and charger line for the I phone.