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4 comments
For volunteering for RL, we were instructed to download Avenza PDF Maps as a tool. I didn't use it on the day, but it seems to work OK. Not sure where you get the maps from though.
I have a premium subscrition to OS Maps (£20 annually). You can purchase maps and download them onto your device. Using the web version you can plot routes etc. As long as you have the offline map on your device it will happily display the route and show your progress. You can try a free version before spending your money but it will require a mobile data signal.
Komoot will let you plan offline routes. Very cyclist-friendly in that you can specify whether you want a road, mountain bike, or gravel route, and it will provide estimated ride times based on your fitness. I think the offline map for your local area is free, or you can purchase upgrades to unlock other areas. I know my area pretty well now so don't use it much on-road but it has been excellent for finding gravel tracks and varying my usual on-road commute routes.
Not my area of expertise, but I believe most phones use aGPS (https://en.wikipedia.org/wiki/Assisted_GPS), so they use the data connection to make the GPS start up quickly
Also, it's not always possible to download the map files if the app uses something that isn't open street map - for copyright reasons
One I've used is ViewRanger, which appears to be able to download OS Maps - but you have to pay for them, and it also does tracking. I've never used it for cycling, so I can't speak as to how it works for cycling.
Also, maybe consider a specific GPS device - you can get some Hiking-type units for about £100 that do most of what you want, though you might have to do some fiddling around with cable ties to get it to mount to the bike