Dave, thanks for the offer of the Pennine Way Trailblazer guide, but I?m letting my 50th anniversary chance to redo the PW go as I live fairly near to it and have done substantial chunks including Hadrian?s, Cross Fell, Langdon Beck this year (guess why). Notice Board sale or swap ?
Your point about digital hand-held devices failing or suffering battery loss is well made, which is why I?d suggest a backup to map downloads to smartphone in the form of a GPS device (or vice versa). At least one mobile phone now offers wireless recharging via another phone, so in the near future charge-sharing might become an additional reserve. I too still carry the paper OS maps, onto which I hand-update changes to the marked route lines (e.g. after walker-made diversions round bogs, difficult terrain, or just legal[ish] shortcuts) and my own set of acronyms, such as BS (bad stile), DN (difficult navigation), etc. With my GPS device it?s easy to create waypoints ?on the go? for features which aren?t on the map, often FBs or WMk posts, which I later add to the paper map.
But that?s for day or weekend walks. On continuous LDPs it?s difficult to see a technology-proof (battery, mobile signal, wireless internet) solution always guaranteed to work, particularly in emergencies or zero-visibility. On both halves of 1969 and 1970 walk of the Pennine Way I carried full sets of 1-inch OS maps with the ?route? on them (the PW in those days was new and well signposted). That must have been three or four maps per half, not that much weight, but now it?s (not always double-sided) 1:25,000s. On later LDPs I sent on replacement 1:50,000 maps to post offices, but that?s not an option these days apart from large towns. So I?d suggest separate one-weeks sets of downloaded double-sided A4 copies of the route, sent on to booked accommodation at strategic places (for the PW that might be Hebden Bridge, Hawes, Bowes). Plus of course the physical compass (my GPS has one but it eats batteries).
I?m an OS mapping subscriber too (very good value at 20 pounds a year for (Premium) 25k coverage of the whole of the British mainland plus the Isle of Man). I use it for initial route creation and re-re-editing on the laptop - the interface is peculiar and has a cul-de-sac which I wish they?d fix rather than bothering with fripperies such as fly-throughs - and for making hard single- or double-page copies of day-routes to carry along with the paper maps. A few years ago* I found an online seller of the (then) 8-year old 25k OS maps on microSD cards for Garmins for less than 40 pounds per card. When I last checked there were none left from that seller, but OS?s replacement cycle - the one I bought and still use had been withdrawn - may mean that the current card soon becomes available at comparable prices. That, I?d suggest, is a better option for hand-held OS mapping than phone apps, at least till Apple releases their (Cross Fell proof) Outdoors iPad.
* ?See Garmin full-GB OS MicroSD/SD card for 39 pounds? below in Gear. In 2018 that seller?s listings included cards for separate UK regions for 26.25 pounds per card at 1;50,000.
See also ?Viewranger on iPhone/iPad? and ?Tablet GPS? in Gear for Viewranger and tablet options.
Iain.