Walk Hamburg and pull the fog off the water

FOG hides the whole world and gives it back one walked street at a time. Hamburg is built around water, so the fog here comes off in rings and ribbons rather than tidy blocks.

A city organised by water

Hamburg is flat, wet and full of edges. The Elbe cuts along the south, the Alster sits in the middle as two lakes, the small Binnenalster and the much larger Aussenalster, and canals thread through everything in between. There are a great many bridges, and after a few days you stop noticing that you cross one every couple of minutes.

The street pattern is a ring rather than a grid. The old fortifications became the Wallring, a green arc that separates the Altstadt and Neustadt from everything further out. Inside it you get the Rathausmarkt, the Binnenalster and the Moenckebergstrasse shopping run. South of that, the red brick canyons of the Speicherstadt lead straight into HafenCity and the Elbphilharmonie, where the streets are new, wide and slightly too clean. West of the centre, St Pauli and the Reeperbahn are a different city again, and the Schanzenviertel just north of them is dense, low and full of short cross streets.

The Alster loop and the Elbe line

Two walks do most of the work. The first is the loop around the Aussenalster, roughly seven and a half kilometres of continuous shoreline path with the water on one side and Uhlenhorst, Winterhude, Harvestehude and Rotherbaum on the other. It draws a clean closed ring on the map and it is almost impossible to get wrong.

The second is the Elbe. Start at the Landungsbruecken, walk west past the fish market, then pick up the riverside path through Altona and along the sand at Ovelgoenne, where the shipping lane is close enough that container ships pass at eye level. Keep going and you reach Blankenese, where the Treppenviertel is a hillside of stairways instead of streets. That is the one genuinely steep thing in Hamburg, and it makes an unusually intricate shape on a fog map.

Why the fog fills unevenly

Hamburg is a big city with a small dense core, so the first few walks feel enormously productive and then the map opens up into long green distances. The water helps and hurts. It helps because a shoreline gives you a continuous walkable line with no dead ends. It hurts because you cannot cut across, so filling the districts on both sides of the Alster means walking most of the way around it twice.

Weather is the honest limitation. It rains a lot, the wind comes off the North Sea with nothing in the way, and winter days are short and grey. Nobody is filling in Eimsbuettel in January on a whim. The upside is that Hamburg walking is flat and the paths are good, so once you are out in it the distance goes down easily.

Background exploring keeps working with the app closed and the screen off, which is the correct arrangement when it is drizzling and your phone is staying in your jacket.

The mechanics

FOG is a fog of war walking map. The whole world starts hidden. Every street you physically walk is revealed permanently, and the reveal does not fade. Ranks climb with area covered: Wanderer, Scout, Pathfinder, Explorer, Voyager. For any city you have walked, it shows the percentage you have lit.

Privacy is the plain kind. No account, no sign up, no cloud, no analytics, no ads, no tracking. The map never leaves your phone, and you can export your data. It works for walking, running and riding, anywhere on Earth. Free to explore, and one purchase of USD 5.99 unlocks unlimited ranks, every character and history import from Google Timeline exports and GPX files. There is no subscription.

Questions people actually ask

Start with a dark map.

FOG is free to explore. No account, no subscription, and your map never leaves your phone.

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