An Geologist uses a handheld GPS unit to mark the flow margin coord...
![An HVO geologist uses a handheld GPS unit to mark the flow margin c...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/vhp_img4060.jpg?itok=rv2SvGLP)
Detailed Description
An HVO geologist uses a handheld GPS unit to mark the flow margin coordinates. The flow field map today was updated by taking a series of GPS points like this around the leading portion of the flow.