NER has a RWGPS Club account which allows members to navigate with routes in the club library without having a paid version of the account themselves. I admit NER is not particularity active with our club account and occasionally we link to the ride leader's route on their personal account if that's the one they've been updating. If you let the RBA (Sarah) or one of the board members (myself, Tsun, etc) know we can make sure to move the route over and send you the club join link. Just make sure to make the request a day or two before the ride.
FWIW, I've been a paid RWGPS account holder for years since well before they had an app. It's probably the one subscription I find most useful although it's mostly for the route creation features.
As for navigating the routes, I use a Garmin eTrex and follow the "breadcrumb" (track) instead of turn by turn directions. It's very reliable and two AA batteries last 24 hours+.
Jake