Walking the West Highland Way: What the Map Actually Tells You
A proper map for the West Highland Way needs to show you more than the trail itself. The route runs about 96 miles from Milngavie to Fort William, and without a solid map, you will find yourself making decisions you do not want to make on a remote ridge. Most people buy the Ordnance Survey Explorer map ATOL 1 or 2, or they use the Rucksack Ranger guide. That is fine. But if you are planning to do this in one go, you need something that shows both the path and the terrain around it. The standard paper option is the OS Explorer 389 for the southern half and 390 for the northern half. Together they cover every mile. The digital alternatives include Outdoor Active, WalkHighlands, and AllTrails. I use a combination of both because phone batteries die and screens crack. Last time I did the walk in late October with a broken GPS module on my watch, I had to fall back on a laminated printout from the OS. The trick is to mark your own campsites and water points with a pen beforehand. I learned that the hard way when I reached Rannoch Station in total blackness and could not read the tiny text on my screen. The real value of the map comes from reading the contour lines. The section around Glen Coe is where most hikers get caught out. The trail climbs and descends more than you expect, and on a rainy day those steep drops look exactly the same as flat ground. The OS maps show this clearly. The digital trail overlays sometimes smooth things over and make it look gentler than it is.
One thing nobody mentions: the detour around Rannoch Moor is not optional. If you try to cut across, you are walking through bog that can soak through boots in under an hour. The map marks the main path. Follow it even when it looks longer. The side tracks are for deer fences and forestry management, not your feet. Another common mistake is underestimating the distance between water sources on the Loch Lomond stretch. The map shows the loch as one big blue block. It does not show that there is no reliable tap between Balloch and Rowardennan unless you count the hotel bars. I carry two liters minimum for that section and top up at the Inn at Balfron if I am running low. The map will not tell you this. It just shows the trail and the water features. If you prefer a single reference book over loose maps, the Rucksack Ranger guide by Eric Riddoch has turned out to be the more reliable option for casual walkers. It includes a map at the front that covers the whole route, though the detail is not as fine as the OS Explorer series. For someone who does this walk once or twice a year, the Rucksack Ranger is probably enough. For someone who wants to know which stile is broken and which bridge is out, stick with the OS maps and check the West Highland Way Facebook group before you go. Trail conditions change fast after heavy rain.
There is also a digital version you can download from the Scottish Natural Heritage website. It is free. The file is large and takes a while to load on a slow connection. I keep it cached on my phone along with the offline maps from Outdoor Explorer. That gives me a backup if the primary app crashes, which it has done to me three times in four attempts. Bottom line: carry both paper and digital. Mark your daily targets on the paper map with a highlighter. Do not trust the distance estimates on the trail signs too much. They are rounded and sometimes optimistic. The OS maps tell the real story about elevation and terrain. Read them before you walk.
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