Roy Smith wrote:

Greg Farris wrote:


I love the Jepp advertisement - says something like "New Technology -
Same Approach" and it shows a paper approach plate and a tablet display
of the same plate. The problem is the paper one looks sharp and detailed,
while the tablet display, although readable, appears pixelated and grainy
by comparison!


This is a real technology problem. For all the wonderful advances in
display technology, we're still nowhere near the resolution available using
ink on paper. A high quality printing press on good paper can do 1000
lines per inch. The best LCD displays today are only about 100 dpi.

I recently replaced my old monochrome laser printer with a good color
laser printer. I use a bright, multipurpose paper recommended by HP.
The Jepp charts are awesome, and the paper is good enough I can print
charts on both sides, on 8.5 x 11 paper.

Trouble is, it is still a reflected light image. The lighting gets bad,
and the chart is difficult to read. Not so with electronic charts.

I don't believe your statement about electronic displays being limited
to 100 dpi is correct. The Jeppesen charts are in vector graphics
format and rescale to fit the "zoom."

In the Part 25 cockpit displays I have seen that are certified, the Jepp
charts are far more flexible and readable under all conditions than my
high-end printouts. And, they are all there all the time.

For flying a Cessna 182 though, my printouts are a quantum leap over
Jepp's paper I used a few years ago.