Metrics question

What are the success metrics for Google Maps?

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What this question tests

Metric tree construction for a utility navigation product used across many contexts.

Clarify Maps serves multiple use cases: navigation, local search and discovery, and business listings, each with different success signals.
State the overarching goal: be the default, most trusted tool for getting somewhere or finding somewhere, driving usage and local business revenue.
Build a metric tree: usage (navigations and searches started per user), quality (ETA accuracy, route deviation rate), and business (local page views, direction requests).
Add a guardrail: ETA accuracy and route safety, since wrong directions actively harm trust and usage.
Segment by use case: driving navigation versus walking or transit versus local search, since growth strategy differs for each.
Tie to monetization indirectly, since local business engagement metrics feed Google's ad and local business revenue.

Separates the product into its real distinct use cases, navigation, discovery, and business, instead of one blended engagement number.
Names ETA accuracy as a critical guardrail, the metric most tied to user trust in a navigation product.
Connects local business metrics to Google's actual monetization path, showing business-model awareness.
Segments by travel mode, since transit, walking, and driving have very different usage patterns and growth levers.

How would you measure ETA accuracy at scale?
How would you weigh navigation growth against local search growth if they trade off?
How does Maps' success tie back to Google's ad revenue?