The map comes with the app
There is nothing to download separately once you have installed it. The map is bundled in, so the terrain around you draws across Rannoch Moor and up the Devil's Staircase the same as it does at home. Your position comes from your phone's GPS, which works from satellites rather than phone masts.
Both versions show elevation for the whole walk and for each day. What Android uniquely gives you is the map itself, bundled in, so the terrain draws with no signal. The iPhone version draws the terrain with Apple Maps, so that part needs a signal.
On the phone
Map and live position
Daily goals
What to pack
Journal
Elevation profile
What you get on Android
Know where you are without a signal
The route is built into the app and your phone finds its position from satellites, not phone masts. You can see exactly where you are on the West Highland Way even with no signal at all.
Set a goal for each day
Tell the app where you are walking to each day — Drymen on day one, Rowardennan on day two — and it guides you there. You always know how far is left today, how the stage is going, and how far remains of the whole walk.
Elevation profiles
See the climbs and descents for the full walk and for each day — distance, ascent, descent and the high point — so you know which days will be the toughest before you set off. On iPhone, climbs are named and given a difficulty.
Find your way back to the route
Took a wrong turn, or staying somewhere off the trail? The app shows you the way back to the route line, so you can rejoin it where you left off or head straight to it in the morning.
What to pack
A ready-made packing list you can edit to suit your walk. Tick items off as they go into the rucksack so nothing gets left behind.
Keep a journal of your walk
Write up each day and add your own photographs as you go. When you are home, export the whole journal as a PDF to print or share.
Walk it in either direction
Heading north from Milngavie to Fort William, or south from Fort William to Milngavie? Switch direction and the guidance, distances and daily goals all follow the way you are actually walking.
Miles or kilometres
Show distances in miles or kilometres, and heights in metres or feet. Pick whichever you are used to.
Day and night mode
Switch between a light and a dark view for early starts, late finishes and bright days on the hill.
Map built into the app
The Android version includes the map itself, so the terrain around you draws whether or not you have a signal.