On page 44 of the manual posted on:
http://www.garmin.com/manuals/82.pdf
Notice there IS an I/O format NONE/NMEA, etc., which puts the Garmin
in Transmit GPS data ONLY mode, and it will not listen to anything.
I'm not sure this Garmin will accept waypoints from an NMEA device.
Look on this page 44 and you'll see a reference to GRMN/GRMN
proprietary BS interface to other proprietary Garmin instruments
SHARING WAYPOINT data. Notice how it says NOTHING about getting
waypoints from anyplace else. This may be an indication it doesn't
listen to waypoint statements from your plotter in NMEA/NMEA mode.
They don't read all the statements and on the bottom of page 59 is the
LIMITED statements it produces, which may not be of use to some
instruments looking for different statements. Most all of them,
however read GPRMB and/or GPRMC statements.

This unit may not talk to your NMEA transmitting plotter for waypoint
input. Looks from the text like it only accepts waypoints from
GARMIN's proprietary data streams.

On page 48 of the manual, you'll also want to be SURE the Garmin is
set to the same Map Datum the plotter is using or you could be way off
somewhere on the chart.
Same is true for the mag heading reference on page 49.

Don'tcha just love being on a boat with 5 DIFFERENT, INCOMPATIBLE,
proprietarydammit interfaces, none of which can talk to anything else
of use? Remember Betamax?

Let's dump it all and tell the manufacturers we'll ONLY BUY PRODUCTS
WITH USB INTERFACES from now on......STANDARDIZED!



On Sat, 16 Aug 2003 18:53:02 +0100, "garry crothers"
wrote:

I have connected the nmea output from the chartplotter to the nmea input of
my gps.

Am I correct in thinking that I should be able to upload waypoints that are
created on my geonav 8 chart plotter to a garmin gps128.

Presently I dont see any....
I know that the connections/speed settings are o.k, because the plotter see
the data from the gps.




Also am I correct in thinking that the autopilot must be driven from the
nmea output from the gps rather that the plotter nmea out.



Larry

Extremely intelligent life must exist in the universe.
You can tell because they never tried to contact us.