After having my PM2's for a couple of months, I finally got a chance to do some experimenting. I set 2 intervisible points at each end of a 3+- mile route survey we've been working on. I processed the data and converted to ground coordinates. The first pair were 660' apart. The distance checked within 0.02' and elevation 0.04'. The second pair were 475' apart. The distance AND elevation checked 0.01'. From one end to the other, our conventional traverse tied in to the PM2 coordinates about 0.90'(not the best closure, but more than adequate for the job). In the next few days, we will close the loop with the TS and see how the adjusted data fits the PM2 data. My bet is that it will be very close. From this and other experiments, I think the PM2 system is WELL worth the money!

What are you PMs users using for occupation time?

Jim Nowlan wrote:

What are you PMs users using for occupation time?

That depends upon site, constellation and ionospheric conditions and the purpose of your survey, but I've found that I rarely get acceptable results from the occupation timer with less than 30 minutes, with some sessions running to 50 minutes or longer. If I had to pick an average for typical survey uses, my experience indicates it's about 40 minutes.

I have found the same results as Jim Frame. The occupation times average about 40-45 minutes. The shortest I used was about 30 minutes on a short baseline and the logest was an hour and 15 minutes on a 10 mile baseline.