Surveyors out in the Jungle Locating Party

2013.8.22Does anyone know where the surveyors are in this image? Who are they working for? What are they surveying for? What is the estimated time period?

What kind of equipment is pictured? What is it called and for what was it used?

Have you ever performed surveying work in Panama? Please share your stories with us.

If you have any information about surveying, please share with us in the comments section!