Agreed. What is it now, 60 years and how many lines of computer code since the dual system came into being? And the legacy data will be a problem fore...

It's trivial in an operational sense, but the definition of the yard was by international agreement. 49CFR 171.10 codifies that definition. The conve...

Perhaps. It was the yard that was defined in terms of the meter, 1 yard = 0.9144 meters. Value for inch was then derived from the value of the yard, 0...

LOL! Discover Magazine is on board with NGS, but maybe a bit misinformed. Have to go down to number 19, but here's their take: ?ÿ

The answers to problem 1 are: Easting = 99,972.856 meters; Northing = 25,147.523 meters; Longitude = 103?ø 39ƒ?? 51.81138ƒ?; Latitude = 39?ø 16ƒ?? ...

To an outsider, it just seems a bit strange. Weather forecasting and climate models already have a substantial number of ways to convert data from -18...

Doesn't the longitude format used in climate model data have something to do with the change to 0 - 360? 

Well, I'll be. So does the HP 50g. If you hit the scroll key twice from the units menu, there it is. I don't see it in the TI 89 menu, though.  ...

The unit conversion feature in an HP50g or a TI89 from feet to meters is international feet to meters. 1,000,000 feet converts to 304,800 meters. Some...

Maybe use the same technique to set out the bases on the little league field. Hard to steal second, but easy to steal third.

I've set my barometer for dry and sunny every day for the past month. Yesterday, it worked for the first time.

Looking at this link, making assumptions about offsets and rotations might be dangerous. Somewhere there are likely some definitions that will make it...

Did they say, "We're from the government and we're here to help you."?

@am95405?ÿ Maybe?? Interpreting 5 1/2 degrees as 5d 30m gives an interval of 5d 29.5m <= 5d 30m < 5d 30.5m, which is 1 minute wide or 1/60 of a ...

Significant digit disagreements have been at the heart of many a test score argument in physics, computer science and a host of other courses. In phys...

Seems to work when entered in the online version, leaving ellipsoid height blank.

The arc-to-chord correction for the quiz is 3.7 seconds. Note that?ÿarc-to-chord = grid az + convergence - geodetic az by rearranging Stem's formula a...

Both azimuths come from the same formula, given by James Stem on page 29 of NGS Manual 5. His version is: t = alpha - gamma + delta, where t is the gr...

Nate, your diagram is an excellent educational piece. You should teach. The quiz does show a fairly long line (11.26 miles), but perhaps not that long...