Using Google Maps to knock, and where it breaks

Google Maps is fine for finding a neighbourhood and useless inside one. There is no way to record what happened at an address, no way to mark a house as worked, and saved pin lists become unusable past a few dozen. Offline maps cover viewing but not the per-address record that makes knocking repeatable.

What it does well

Getting you to the area, showing you the street layout, and giving you a rough sense of density before you commit an afternoon. For that it is excellent and free.

Where it breaks

The moment you need to remember what happened. Pins hold a label and nothing else, there is no disposition, no date, no history, and no way to see which houses on this street you already did.

Past a few dozen pins the list stops being navigable, which is roughly one good afternoon.

The offline half-answer

Offline maps let you view an area without signal. They do not give you a place to log a knock, so the part that fails in a dead zone is still the part you care about.

Common questions

Can I use Google Maps to track door knocking?
For a handful of doors, just about. It has no disposition, no history and no date, so it stops working quickly.
Do Google Maps offline maps help?
For viewing, yes. You still have nowhere to record what happened at the door, which is the thing you need in a dead zone.
How many pins before it becomes unusable?
Reps generally hit it within a few dozen, which is about one productive afternoon.