Morning,
Yes, I use OS25k as a general rule, but viewranger also uses open Cycle map and open street map, both of which are excellent for bike planning.
The Viewranger Terrain map is also free and excellent for simple on the ground planning without all the complexities associated with some of the better 25K maps like Harvey and OS.
The joy of viewranger for me over the other apps I use is its live map that rotates around you so that the direction you are pointing is always correct on the map and the zoom level you can get to, alongside having your own markers saved such as maybe a right turn arrow placed at a point you think may be complex, or indeed on every turn you do just to make it very clear what’s coming up next (ok, next junction I come to is a right turn by a river...)
Also, the ability to buy a new map tile for that days ride live straight from the app very cheaply is excellent.
It has every feature from every other App I am sure, and I quite like it’s buddy beacon feature that will ping your location back to a loved one periodically if you are out riding alone. (My wife can load up viewranger and look at where I’ve been and was last seen for example (needs data connection and yes, it can be disabled)
It’s as accurate as the two standalone GPS units I own for sure, but then why wouldn’t it be? People do tend to forget that phones are £500-£1000 pieces of hardware and their GPS sets are normally very decent indeed, utilising not just the old GPS systems but also GLONASS and of course assisted locate which is I believe unique to smartphones, allowing them to use cell transmitter triangulation to obtain a location fix.
The screen resolution is normally far superior on the phone too. But of course phones are far more fragile and have worse battery life.
(Airplane mode often rectifies - remember, GPS does NOT need a data connection or even a sim, and phones without social media apps and email are actually very power efficient!.)
I use a Suunto Ambit 3 Peak on my wrist during all big hikes and rides and love it for its exceptional fitness data collection ability, but for following a map at cycling speeds... hate it. The screen is just too small to differentiate at a Junction with a few options, or even when side roads / paths are within say 20 meters.
I bought a handheld unit too about 8 years ago after a really bad whiteout in a blizzard up on Scafell Pike got me quite scared because I couldn’t orientate my map and compass to a feature
(Whiteout...can’t see) and I knew I was close to big cliffs Which scared me and made me very close to Cragg fast for a while.
That spur of the moment waterproof, temperature proof and expensive purchase was a regret for some time and I always found myself referring to my phone for guidance. It’s maps were crazy expensive too!
Eventually I conceded that a phone was a generally a better option and I just used the wife’s old iPhone 5S as a dedicated Nav unit and never looked back.
I must add you should be able to use a map and compass and carry one with you if your are going anywhere remote. It can save your life when the technology fails.
Image of a better day up up at 3000ft on the Pike just to brighten the topic. There is a good reason that stretcher box lives up there. Lol
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