Did a 200k brevet on Saturday. 10:45 ET. Garmin said it had 1% left. Brought an auxiliary pack but didn't use it. I pre-plot my brevet routes, also. If they just publish a cue sheet, I use that to create a route to download and then print my own cue sheet with my own remarks that fits in my waterproof BarMap holder. My control card with a pen goes into a Ziploc in my jersey pocket.

I like having a cue sheet, too. It is said that you can tell those who navigate only with GPS because they go 50' past a turn, then circle back.

That said, if Chris Ragsdale had been using a GPS, he would have been first to finish at PBP, 50' off route instead of 20 klicks.