Sorry, I didn't read carefully enough before posting. Then I immediately did figure it out and corrected my post while you guys were composing your r...

Tom's principle is good, but the accuracy of the elevation change may not be adequate. It certainly does suggest another place to look, though.As oth...

I wouldn't build anywhere close to a flood zone of any kind. You don't know what the next revision will show, and haven't they ended grandfathering?

Interesting mount for the TS in the second picture.

I figured out that some picture formats support a transparent color for your background and others don't. PNG, for instance, works much better than o...

Don't Sell The Dip Needle ShortHow does the dip needle compare to the Schonstedt looking for a pin along a metal fence?

>use the sights on the compass to look back toward where he has just came from to then establish the line to go forward. Having a forward and rear ...

An actual instrument used by Mason and Dixon for star sights to determine latitude. Portions are missing. Kept at Independence Hall, not usually on ...

A few more pictures. I'm sure Rich has better ones, since he was frequently seen using his camera.It was an entirely successful event from my perspec...

I don't think most NGS data sheets give ellipsoidal heights, which is what GPS inherently measures. There is a geoid model involved in getting from e...

My Brother laser printer starts complaining about low toner when the cartridge is about half empty. If you put black electrical tape over a hole you ...

PY0160* NAVD 88 ORTHO HEIGHT - 1903.109 (meters) 6243.78 (feet) ADJUSTED PY0160 NGVD 29 (08/20/92) 1901.880 (m) 6239.75 (f) ADJ...

The metal structure looks like a corner reflector for being a radio frequency/microwave/radar target. Same idea as the glass, but for longer waveleng...

I have often wondered what the noticeAn hour's consultation with any qualified radio engineer would have told them that their plan would be likely to ...

Useless metadata> When you don't know what you are doing, place useless metadata on the plat. A fine example in the lower left corner of the map in...