Walk Mumbai and the map fills in as a ribbon
FOG covers the whole world in fog. Every street you physically walk in Mumbai clears permanently. It runs in the background, and nothing leaves your phone.
South Mumbai in FOG, the fog burned off in a thin band running from Colaba up the Marine Drive seafront.
Long and thin, by geography
Mumbai was seven islands before it was a city, and it still walks like a peninsula. The Arabian Sea is on one side, the harbour on the other, and in the south you are never more than a fifteen minute walk from water in both directions. That shape decides what your map looks like. You do not build a blob here. You build a stripe that grows north.
The colonial core is the exception, and it is the best walking in the city: the Fort district and Kala Ghoda, Horniman Circle, the causeway down through Colaba. Streets there are short, connected and shaded by arcades. North of that the city stretches out through Dadar, Bandra, Andheri and beyond, and distances stop being walkable in an afternoon.
A route worth doing once
Start at the Gateway of India and walk south down Colaba Causeway, then cut back north through the Fort grid past Horniman Circle and the university, out to Chhatrapati Shivaji Maharaj Terminus. Turn west, pick up Marine Drive at Nariman Point and follow the whole curve of the bay to Girgaon Chowpatty. It is about three kilometres of unbroken seafront pavement with nothing to cross.
If you still have legs, climb into Malabar Hill for the Hanging Gardens and drop down the steps to the Banganga Tank. In the northern suburbs the equivalent is the Carter Road promenade in Bandra, out to Bandstand, then inland along Linking Road.
What makes it hard here
Two things. The monsoon, from June into September, genuinely stops walking. Streets flood, footpaths go under, and you lose most of a quarter. Outside that the heat and humidity cap how long you last, so early morning is when the city actually walks.
The other is that footpaths are contested. Hawkers, parked scooters and construction push you into the carriageway, and long stretches of arterial road have no pavement at all. Add the high-rise clusters at Nariman Point, Lower Parel and Worli, where towers bounce the signal and the trace can wander a block sideways. Walk the same street twice and it settles.
The upside is real too. The old south is so dense with small streets that a couple of hours of wandering clears far more map than the same effort in a spread out city.
How FOG works
The whole world map starts hidden. Only the streets you physically walk are revealed, and they stay revealed. Background exploring keeps it running with the app closed and the screen off, which suits a city where you are outside in short bursts between trains.
Free to explore. A single purchase of USD 5.99 unlocks unlimited ranks, every character and history import, and there is no subscription. Ranks go Wanderer, Scout, Pathfinder, Explorer, Voyager as the area you have covered grows. City percent tells you how much of Mumbai you have lit. The collection covers 241 countries, 3,390 regions and 7,342 named places, all of it earned by standing there.
There is no account, no cloud, no analytics, no ads and no tracking. Your map stays on the phone, and you can export it.
Questions people actually ask
Does the local train count?
FOG reveals where you go, so a train line will clear along the route it takes. Most people care about the walking, which is the part you cover on foot between stations and at either end.
Will the towers around Lower Parel confuse it?
Dense high rise can make any phone GPS drift by a block. It usually corrects itself, and walking the same street again cleans the line up.
Can I load in walks from before I installed it?
Yes. The USD 5.99 unlock includes history import from Google Timeline exports and GPX files, so old movement fills the map in one go.
Is there a subscription?
No. One purchase, USD 5.99, and that is the whole thing. Exploring itself is free.
Start with a dark map.
FOG is free to explore. No account, no subscription, and your map never leaves your phone.
free to explore · one purchase unlocks everything · never a subscription