A sturdy wooden stake, typically two inches square, driven deep into the ground until the top is nearly flush with the dirt. Surveyors tap a small nail or tack into the top center of the wood to mark the precise coordinate point. Hubs are used to establish traverse stations or temporary benchmarks that need to remain stable for the duration of a construction project.
Heard on the job
Drive a hub at the top of the slope and set up the instrument over it.
Insider tip
To make a hub easy to find later, surveyors usually drive a taller, brightly flagged guard stake right next to it.
Also heard as
- hub and tack