Hello Rookie and Longjog,
I did on Thursday the 2e June a 356 km ride with the GH625, with the power bank (2* needed) I managed to get around in 11:31 bicycle time. I hope with the new GB580P I don't need to carry the power bank with me for the total time. I did split the track in tree parts, this way it is more accurate because of the smarttrack points
Did one of you discovered this as well?