Cambridge 302A CFR questions

[[email protected]]

I thought this would be simple, but I can't find the answers in the
manual.
1. How many turnpoints can I load into the memory (not the task, but
the turnpoint file)?
2. What NMEA sentences are output to the serial port?
3. Not that I will do it, but can I change the data output to NMEA
sentences other than the default?
Questionable minds want to know.....

[[email protected]]

On Apr 22, 2:30*pm, wrote:
> I thought this would be simple, but I can't find the answers in the
> manual.
> 1. *How many turnpoints can I load into the memory (not the task, but
> the turnpoint file)?
> 2. What NMEA sentences are output to the serial port?
> 3. Not that I will do it, but can I change the data output to NMEA
> sentences other than the default?
> Questionable minds want to know.....

According to the articles page on the Cambridge website, the 300
series holds up to 250 "turnpoints".

The Cambridge articles only mention NMEA-0183 output. No mention of
anything else or of any "options" to change it.

[[email protected]]

>
> According to the articles page on the Cambridge website, the 300
> series holds up to 250 "turnpoints".
>
> The Cambridge articles only mention NMEA-0183 output. No mention of
> anything else or of any "options" to change it.

Hmmm... Now that I look closer, it seems that info is for earlier GPS-
NAV models. I don't see anything for the newer 300 series.

[[email protected]]

On Apr 22, 2:30*pm, wrote:
> I thought this would be simple, but I can't find the answers in the
> manual.
> 1. *How many turnpoints can I load into the memory (not the task, but
> the turnpoint file)?
> 2. What NMEA sentences are output to the serial port?
> 3. Not that I will do it, but can I change the data output to NMEA
> sentences other than the default?
> Questionable minds want to know.....

Here's some good details regarding the data port and NMEA sentences:
http://www.cambridge-aero.com/manuals/dataport_300_sv517_rev21.pdf

[[email protected]]

On Apr 22, 1:31*pm, wrote:
> On Apr 22, 2:30*pm, wrote:
>
> > I thought this would be simple, but I can't find the answers in the
> > manual.
> > 1. *How many turnpoints can I load into the memory (not the task, but
> > the turnpoint file)?
> > 2. What NMEA sentences are output to the serial port?
> > 3. Not that I will do it, but can I change the data output to NMEA
> > sentences other than the default?
> > Questionable minds want to know.....
>
> Here's some good details regarding the data port and NMEA sentences:http://www.cambridge-aero.com/manuals/dataport_300_sv517_rev21.pdf

Excellent reference! EXACTLY what I was looking for, THANKS!

[Paul Remde]

Hi James,

The 302 and 302A support up to 1500 waypoints.

I don't think there is a way to change the output NMEA sentences.

Below is a data capture from a 302. The 302 send similar data, but no wind
or airspeed data. I believe the !w sentence is not sent by the 302A. It
contains the 302 air data.

!w,000,000,0000,500,01287,01020,-0668,191,199,191,000,000,100*44
$GPRMC,163805,V,4448.5614,N,09333.0117,W,000.0,000 .0,260304,002.1,E*7D
$GPRMB,V,,,Stanton ,,4308.8388,N,09300.9833,W,,,*47
$GPGGA,163805,4448.5614,N,09333.0117,W,0,00,00.0,0 .0,M,0.0,M,,*5F
$PCAIB,00280,00067
$PCAID,N,+00224,000,128*05

I created an Excel spreadsheet a while back that compares the data output
from a 302 and 302A. I'd be glad to e-mail it to you if you send me a note
asking for it.

Paul Remde
Cumulus Soaring, Inc.
http://www.cumulus-soaring.com

> wrote in message
...
>I thought this would be simple, but I can't find the answers in the
> manual.
> 1. How many turnpoints can I load into the memory (not the task, but
> the turnpoint file)?
> 2. What NMEA sentences are output to the serial port?
> 3. Not that I will do it, but can I change the data output to NMEA
> sentences other than the default?
> Questionable minds want to know.....

[Tony Verhulst]

> According to the articles page on the Cambridge website, the 300
> series holds up to 250 "turnpoints".


I'm pretty sure that that's the model 20/25 limit.

Tony V.

[[email protected]]

On Apr 22, 8:38*pm, "Paul Remde" > wrote:
> Hi James,
>
> The 302 and 302A support up to 1500 waypoints.
>
> I don't think there is a way to change the output NMEA sentences.
>
> Below is a data capture from a 302. *The 302 send similar data, but no wind
> or airspeed data. *I believe the !w sentence is not sent by the 302A. *It
> contains the 302 air data.
>
> !w,000,000,0000,500,01287,01020,-0668,191,199,191,000,000,100*44
> $GPRMC,163805,V,4448.5614,N,09333.0117,W,000.0,000 .0,260304,002.1,E*7D
> $GPRMB,V,,,Stanton * * ,,4308.8388,N,09300.9833,W,,,*47
> $GPGGA,163805,4448.5614,N,09333.0117,W,0,00,00.0,0 .0,M,0.0,M,,*5F
> $PCAIB,00280,00067
> $PCAID,N,+00224,000,128*05
>
> I created an Excel spreadsheet a while back that compares the data output
> from a 302 and 302A. *I'd be glad to e-mail it to you if you send me a note
> asking for it.
>
> Paul Remde
> Cumulus Soaring, Inc.http://www.cumulus-soaring.com
>
> > wrote in message
>
> ...
>
>
>
> >I thought this would be simple, but I can't find the answers in the
> > manual.
> > 1. *How many turnpoints can I load into the memory (not the task, but
> > the turnpoint file)?
> > 2. What NMEA sentences are output to the serial port?
> > 3. Not that I will do it, but can I change the data output to NMEA
> > sentences other than the default?
> > Questionable minds want to know.....- Hide quoted text -
>
> - Show quoted text -

Thanks Paul,
I was wondering about the waypoint limitation because I used to have
the impression there was a 250 waypoint limit (don't know where I got
that idea) and had already exceeded that by loading 456 waypoints.
Thanks also for sending the data stream. I'll hook mine up tonight
and play little. I am particularly interested in the PCAID
sentence. I use XCSoar, and it currentlly doesn't properly display
the pressure altitude (always shows zero). I wasn't sure if cambridge
included that in the output datastream, or just recorded it in
the .igc file.
.... and thanks for having so much great information on your
website!