People frequently map waypoints with the MobileMapper with the expectation that they have used the full functionality of the GPS receiver.

This question comes up often enough to encourage me to share examples of my science projects with you. It is why you will find examples of my work with the ProMark2, ZMax, and MobileMapper in the training folder.

This weekend it was about using my new eXplorist100 and eXplorist300 receivers to mark waypoints on some surveyed points and compare them with the results of some work I did with the ZXtreme and the MobileMapper.

The shape files made from my waypoints are in the MobileMapper folder in the training folder along with one map that illustrates the relationship between the survey monuments, the same points mapped as features with the MobileMapper, and waypoints marked with my new hand held receivers.

One of the new maps is something inspired by John Francis who asked about doing GPS work in a parking garage one day. I entered the bottom level of the parking garage near the southest corner and walked up to the top near the northwest corner. You can see all three rotations as I went to the top level. The bottom one is not what anybody would call accurate. But as I started the science project I thought it would probably not show most of my walk up through the garage.

They still make parking garages with rebar . . . right?

John,

The rebar is spaced out on 8-12" centers. I would recommend doing parking garages when they are empty, as it seems cars are still made out of a lot of steel and iron.

Phil,

How full was said garage?

You always say, Redundancy, etc., etc. Why didn't you leave the unit on when you walked back down?

Paul in PA

Rebar: I was not there when they built it but this real estate wiggles around quite a bit. My guess is that it has more than average reinforcement.

Cars: Only a few. It was Saturday and this parking garage serves an office complex.