1. The attacker can use multiple accounts to collect data, so an offset specific to the viewer wouldn't work 2. If you can collect the offset location over a l

1. The attacker can use multiple accounts to collect data, so an offset specific to the viewer wouldn't work 2. If you can collect the offset location over a longer time, you can correlate it with likely travel paths (e.g. along major roads) to figure out what the offset is.