Ground speed estimation

[Mark_BX25D]

View attachment 59742

Download the Speedometer App on your phone. It's VERY accurate.

GPS apps can be accurate for straight-line distances. The longer you drive in a straight line, the more accurate they are.

They are not much good for twisty roads, but of course, that's not the question here.

 

[Magicman]

The only time that I have used this app is then I was adjusting the governor/speed on my new golf car. I kicked the top speed from 19 mph to 23 mph. I actually hit 26 mph but backed it down to the 23 mph, but of course that also is not the question here.

 

[GeoHorn]

I have read that a smartphone has more "electronics" than the Apollo Spaceships had.

That’s probably true. In the mid-80s I worked for an outfit which had a marketing-relationship with the MSC in Houston and we visited and got some ”hands-on” experience with some of the hardware. It was common, everyday aircraft stuff, nuts-and-bolts-wise....nothing particularly exotic, and the electonics were clearly “dated”.... heavy and bulky by todays standards.
Keep in mind, the guys sitting at their consoles were still using slide-rules to speed-up their calculations.

 

[gsganzer]

Do a test spray with water only and see what you're gallons per acre are at the speed you feel comfortable with.

 

[bmblank]

I have read that a smartphone has more "electronics" than the Apollo Spaceships had.

When you factor in the user of each, the overall computing power is more than comparable.