ve7gdh at rac.ca
Sun Nov 29 05:27:36 EST 2009
Andrew VK4TEC wrote...
> Does anyone know the data format GPS positions are sent from these GPS
> equipped ELB's ?
A 10 second search for ELB didn't yield much info, but changing to ELB
emergency locator beacon did a bit better. Following a link to
For 406 MHz beacons...
* GPS Position can be encoded into the Hex Code and can be updated
real-time via GEOSAR
* Encoded GPS position accuracy is about 15 m (45 ft), however, the
space in the hex message protocol for position information is limited,
so transmitted accuracy is approximately +/- 125 metres
* Increases in accuracy are a significant improvement over analog
beacons - from two possible positions within a 20 km radius, to 15m
accuracy at one position; an improvement in accuracy of over 2500.
It's kind of a vague answer, but so was your question as there are many
types of "emergency locator beacons". Assuming this is what you were
looking for, a search for GEOSAR led me to www.cospas-sarsat.org.
Maybe one of the following will be useful to you...
Beacon Coding Guide
406 MHz Coding Tutorial
Specification For Cospas-Sarsat 406 MHz Distress Beacons
In the "complete document" PDF file, scroll down to pages 45 - 57.
73 es cul - Keith VE7GDH
"I may be lost, but I know exactly where I am!"
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