"Who Me" wrote in message
...
I am trying to get True Wind from my ST40 Wind instrument.

I am using a Raymarine E85001 SeaTalk/NMEA converter box to take the NMEA
0183 output from my Garmin GPSMAP175 GPS and send it to the ST40 Wind.

Connecting a PC to the RS232 terminals of the E85001 shows that both
instruments are talking to the E85001, but the ST40 Wind still does not
compute true wind. The GPS is sending NMEA sentences VTG and RMC which
both have boat speed information in them, so I don't understand why the
ST40 won't use it. I've tried choosing different NMEA output settings on
the GPS, and the sentences change slightly, but the ST40 still ignores the
boat speed info.

The ST40 is talking happily to my ST1000+ AutoHelm, and the AutoHelm is
also receiving track data from the GPS (directly, not through the E85001),
so it seems only the ST40 Wind doesn't want to play ball :-(

I've tried contacting Raymarine but it's been nearly two weeks now, and
they still haven't replied to my query, though I live in hope.

Anyone got any ideas what might be going on?

Who.

I've tried contacting Raymarine but it's been nearly two weeks now, and
they still haven't replied to my query, though I live in hope.

Did you send a note to technical assistance from their web page? I sent
them a note yesterday asking if GPS waypoint data would be picked up by
Seatalk and then tranlsated back to NMEA format by the E85001 and they
phoned me today with an answer. (unfortunately the answer is no and therefor
I must run a separate wire from my GPS to my radar). I was put in touch
with

Winston Savage
Technical Support Specialist
Rayamrine Inc.
http://www.raymarine.com

at

Gordon Wedman wrote:


I've tried contacting Raymarine but it's been nearly two weeks now, and

they still haven't replied to my query, though I live in hope.

Did you send a note to technical assistance from their web page? I sent

Yes, using their online form. It sent me an email, and the question is
still there on their website where I can update it, add files, etc.
They promised to get back to me within three business days but apart
from the initial email, I've heard nothing.

them a note yesterday asking if GPS waypoint data would be picked up by
Seatalk and then tranlsated back to NMEA format by the E85001 and they
phoned me today with an answer. (unfortunately the answer is no and therefor

I'm in Australia so I don't really expect them to ring me :-) We do
have email down here though, so I was hoping to hear something from them
that way, even if the answer is no.

Unfortunately, I think I've received my answer from the other posters in
here - I need to go outside the Raymarine stable to solve the problem by
changing boat speed over ground into boat speed over water :-( I should
have bought a different NMEA - Seatalk bridge that could do the data
manipulation for me instead of the E85001.


Winston Savage
Technical Support Specialist
Rayamrine Inc.
http://www.raymarine.com

at


Thanks for that. If I need more help, I may use it.

Who.

That appears to be the case. I have the same bridge set-up except with ST-50
Wind. When I was designing it, I became concerned about data sentence
conflicts with Seatalk, converted Seatalk and NMEA all running on the same
buss. And, like you, I was curious about whether it was possible to use GPS
SOG rather than boat speed. One chap who seemed to know a lot about this
indicated that in case of conflict, Seatalk prevails. So it seems that if
boat speed is available in Seatalk, your instrument will ignore other data.
Additionally, as far as I know, Seatalk format speed is the required input
for that instrument. So short of some programming to fake it (convert NMEA
to Seatalk), I don't think there's a workaround. I wasn't willing to go that
route, and it had the shortcomings descibed in other posts.
Len


Unfortunately, I think I've received my answer from the other posters in
here - I need to go outside the Raymarine stable to solve the problem by
changing boat speed over ground into boat speed over water :-( I should
have bought a different NMEA - Seatalk bridge that could do the data
manipulation for me instead of the E85001.
..

"Len Krauss" wrote in message ...
So short of some programming to fake it (convert NMEA
to Seatalk), I don't think there's a workaround. I wasn't willing to go that
route, and it had the shortcomings descibed in other posts.
Len


I had the same problem on my boat. So I made my own bidirectional
SeaTalk-Nmea Bridge that can fake gps SOG to Boat Speed and send it
to SeaTalk.
To anyone who is interested have a look at

http://www.tklinux.de/inhalt_e.html