SPOT should be ashamed

5Z wrote:
But there's always hope that a more pilot friendly device can be built
on top of this one by adding a few more buttons or at least changing
the firmware. They will likely charge a bit more for the service as
we'd like to have a better chance of our live track getting received,
so it will need to send more position reports, thus cluttering the
bandwidth, etc...

I looked at implementing a SPOT-like device using this technology years
before SPOT was announced, the main problem (aside from being transmit
only) is that data messages to the Globalstar network contain only a
small number of bits (56?). After one encodes latitude and longitude at
a useful resolution, about all that is left is a few bits to encode
"OK", "HELP", etc. I suspect an upgrade would require more satellites,
something which Globalstar may not be able to afford...

Marc

I phoned England where the provider of the 911 is located
asking to test my SPOT,s 911 I was told that there are not willing and able
to
have the system tested ! So if I can not test the 911
like a ELT what is the use, all it provides me with is a false security.
By the way just try the SPOT warranty system, make sure you
have your credit card on hand because you pay for everything
even if it fails when you take it out of the box







"Marc Ramsey" wrote in message
news
5Z wrote:
But there's always hope that a more pilot friendly device can be built
on top of this one by adding a few more buttons or at least changing
the firmware. They will likely charge a bit more for the service as
we'd like to have a better chance of our live track getting received,
so it will need to send more position reports, thus cluttering the
bandwidth, etc...

I looked at implementing a SPOT-like device using this technology years
before SPOT was announced, the main problem (aside from being transmit
only) is that data messages to the Globalstar network contain only a small
number of bits (56?). After one encodes latitude and longitude at a
useful resolution, about all that is left is a few bits to encode "OK",
"HELP", etc. I suspect an upgrade would require more satellites,
something which Globalstar may not be able to afford...

Marc

On Apr 30, 7:56 pm, "D.Rizzato" wrote:
I phoned England where the provider of the 911 is located
asking to test my SPOT,s 911 I was told that there are not willing and able
to
have the system tested ! So if I can not test the 911
like a ELT what is the use, all it provides me with is a false security.

Except for a few bits in the message itself, there is no difference
between 911, HELP, or OK. You can test it to your heart's content by
sending either of the latter messages to yourself or friends.

I don't know about the UK, but in the US, dialing 911 from my house
just to see if it works is not permitted. So I have to trust that if
I get a dial tone, I'll be able to reach 911.

It's possible that the connection between the SPOT message handling
center and their 911 center is down, but I assume the message handling
system will keep trying until a human acknowledges the request. It's
also possible the 911 button on your unit is broken, but then the LED
won't flash, and you'll know it. If the LED flashes, and if a recent
OK message went out, you can be fairly confident that the 911 will go
out as well.

As for customer support, I've had excellent response with general and
technical questions. Every business, no matter how good, will
occasionally **** someone off and with the internet, we find out about
it much more often that in the past.

Bottom line, this device is damned inexpensive for what it provides.

-Tom

5Z wrote:

Except for a few bits in the message itself, there is no difference
between 911, HELP, or OK. You can test it to your heart's content by
sending either of the latter messages to yourself or friends.

I don't know about the UK, but in the US, dialing 911 from my house
just to see if it works is not permitted. So I have to trust that if
I get a dial tone, I'll be able to reach 911.

Nor do you turn on your ELT and wait for search and rescue to show up,
to see if it "works".

It's possible that the connection between the SPOT message handling
center and their 911 center is down, but I assume the message handling
system will keep trying until a human acknowledges the request. It's
also possible the 911 button on your unit is broken, but then the LED
won't flash, and you'll know it. If the LED flashes, and if a recent
OK message went out, you can be fairly confident that the 911 will go
out as well.

If you don't trust their 911 service, make the "send help" button your
personal 911, with a friend/wife/employee with email or a cell phone
ready to call search and rescue. Not as elegant, but you can "test" it.

--
Eric Greenwell - Washington State, USA
* Change "netto" to "net" to email me directly

* Updated! "Transponders in Sailplanes" http://tinyurl.com/y739x4
* New Jan '08 - sections on Mode S, TPAS, ADS-B, Flarm, more

* "A Guide to Self-launching Sailplane Operation" at www.motorglider.org

On Apr 30, 6:30*pm, Marc Ramsey wrote:
5Z wrote:
But there's always hope that a more pilot friendly device can be built
on top of this one by adding a few more buttons or at least changing
the firmware. *They will likely charge a bit more for the service as
we'd like to have a better chance of our live track getting received,
so it will need to send more position reports, thus cluttering the
bandwidth, etc...

I looked at implementing a SPOT-like device using this technology years
before SPOT was announced, the main problem (aside from being transmit
only) is that data messages to the Globalstar network contain only a
small number of bits (56?). *After one encodes latitude and longitude at
a useful resolution, about all that is left is a few bits to encode
"OK", "HELP", etc. *I suspect an upgrade would require more satellites,
something which Globalstar may not be able to afford...

Marc

dont you just need 1 bit to encode "okay" vs "/okay"
alright, 2 bits if you want "okay", "/okay", "fallen can't get up"