Interesting consequence of improperly programming GPS route

"Jose" wrote in message news:IeDse.6352

By using paper charts, a compass, and dead reckoning as backup, I mean to
actually use a plotter, draw a line on the chart, and measure the course
line. Your paper chart indicates (for example) a desired course of 170,
and your GPS says 190. Something's wrong.

Well, I guess I didn't clarify. Oceanic, that's what you do with a plotting
chart. Its a line on paper, but its just a small scale chart so when you
line in the trip pre-flight, you can get the entire trip on one sheet
smaller than an enroute chart. All the DR data that might be needed for
reference...time, distance, course for each leg... is contained on the
computer generated flight plan -- its part of the cross check.
For a local or regional GA flight, your absolutely right -- the GPS data
ought to be periodically back-checked against a chart.

All the DR data that might be needed for
reference...time, distance, course for each leg... is contained on the
computer generated flight plan

.... and if the computer's wrong, do you draw the wrong line on the
chart? We might be saying the same thing here, but I am advocating
drawing the line with =no= computer help whatsoever, and using a plastic
plotter to figure the course lines. This would be totally independent
of the computer, and then when the computer does its thing, you have a
reality check.

Jose
--
"Never trust anything that can think for itself, if you can't see where
it keeps its brain."
(chapter 10 of book 3 - Harry Potter).
for Email, make the obvious change in the address.

On Fri, 17 Jun 2005 22:42:36 GMT, Jose
wrote:

... and if the computer's wrong, do you draw the wrong line on the
chart? We might be saying the same thing here, but I am advocating
drawing the line with =no= computer help whatsoever, and using a plastic
plotter to figure the course lines. This would be totally independent
of the computer, and then when the computer does its thing, you have a
reality check.

Drawing the line on a plotting chart is done with =no= computer help,
which is precisely why the chart is a valid cross check, along with
the "raw data" contained within the Flight Plan.

Jose

-Jack Davis
B737

-J. David
B737

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"Jose" wrote in message news:wlIse.2580

... and if the computer's wrong, do you draw the wrong line on the chart?
We might be saying the same thing here, but I am advocating drawing the
line with =no= computer help whatsoever,

That's actually a little impractical where oceanic crossings are concerned.
Routes are assigned based on several factors, and you only get the
information when the flight plan is generated. The waypoints are merely
Lat/Long points. You could draw the whole thing by hand, but you'd be
starting with computer generated data, anyway.

What you're suggesting is actually covered by quickly pencilling the
assigned route onto the plotting chart, and applying the smell test.