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[aprssig] more ocean buoy stuff

Robert Bruninga bruninga at usna.edu
Wed Jan 10 14:02:16 UTC 2007


> Bob, do your Academy buoys have drogues attached?

We arent sure.  We know they are required for true current
measurements, but for our initial test in the chesapeake bay, we
may go without, so that we don't get fouled by all the shallow
water and junk down there.

> Also, I'm curious what speeds you normally see from your
buoys.

Although we have material for 8 buoys, none are in the water
yet.

> And if you derive direction from the position reports or is
> It reported from GPS, as most GPS can't calculate heading
under
> 2kts of speed.

The GPS and APRS format includes the GPS's estimate of CSE/SPD,
but as you say, that could be quite useless.  But for our
chesapeake bay stuff, we will get enough hits to have a pretty
good track for calculating it from position.

Thanks for your comments.  As we get into this we may want to
compare notes.
Bob,Wb4APR


> 
> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> [mailto:aprssig-bounces at lists.tapr.org]
> On Behalf Of Robert Bruninga
> Sent: Tuesday, January 09, 2007 15:13
> To: 'TAPR APRS Mailing List'; mjandthegang at yahoo.com
> Subject: RE: [aprssig] more ocean buoy stuff
> 
> > 3) While the APRS format normally only includes lat/lon
sorts
> of 
> > things, there would be no problem  adding some more data. 
> 
> Our Naval Academy Buoy Designs use the standard APRS 5 channel
> telemetry format of the MIM, Mic-E and KPC-3+ designs.  We use
> these 5 channels as follows:
> 
> Ch1 Battery volts
> Ch2 Water Temp
> Ch3 Water Temp
> Ch4 Luminosity
> Ch4 Water conductivity (Salinity)
> 
> In addition, you get automatically from the GPS posit, the
> LAT/LONG, direction and speed.
> 
> And the decoding and display of all that data is automatic in
> FINDU.COM no matter where your buoy is.
> See our Buoy Page: http://www.ew.usna.edu/~bruninga/buoy.html
> 
> See how easy it is to display your data LIVE From FINDU.COM:
> http://www.ew.usna.edu/~bruninga/andeTLM1.html
> 
> That data happens to be ANDE satellite data, but its because
our
> buoy is temproarily out of the water and so after 10 days,
> FINDU.COM is no longer showing the Buoy data.
> 
> 
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