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Posted by B A R R Y on December 8, 2006, 7:12 am


JC wrote:
> I was disappointed that my new (and otherwise awesome) Nuvi 660 still
> says "Lost Satellite Reception" when going through tunnels. It should
> know how to calculate when I enter the tunnel going X mph, and the
> tunnel is Y miles long, generally how long it should keep its clap shut.
> In that respect it acts just like the SPIII did back in the Jurassic
> era.
>

It DID lose satellite reception. <G>

I would much rather know that it doesn't have a sat lock, rather than
have it guess why and try to decide if I need to know. Some of RF is
reflected into the tunnel, so you have some sort of a signal at both
ends. This means you keep a lock as you enter, and at least on my
current units, regain it quickly at the other end. Big deal...

If you can manage getting from one end of the tunnel to the other
without getting lost, you should be fine.

Really need to know what direction you're headed in underground? Many
of the magnetic compass equipped units will at least give you a
directional reading without a lock.

Posted by Ramon F Herrera on December 8, 2006, 2:52 pm



B A R R Y wrote:
> JC wrote:
> > I was disappointed that my new (and otherwise awesome) Nuvi 660 still
> > says "Lost Satellite Reception" when going through tunnels. It should
> > know how to calculate when I enter the tunnel going X mph, and the
> > tunnel is Y miles long, generally how long it should keep its clap shut.
> > In that respect it acts just like the SPIII did back in the Jurassic
> > era.
> I would much rather know that it doesn't have a sat lock, rather than
> have it guess why and try to decide if I need to know. Some of RF is
> reflected into the tunnel, so you have some sort of a signal at both
> ends. This means you keep a lock as you enter, and at least on my
> current units, regain it quickly at the other end. Big deal...
> If you can manage getting from one end of the tunnel to the other
> without getting lost, you should be fine.

> Really need to know what direction you're headed in underground?

DR is very useful when you find yourself inside cannons -in Manhattan
or in Yellowstone.

-Ramon


Posted by B A R R Y on December 8, 2006, 3:08 pm


Ramon F Herrera wrote:
>
> DR is very useful when you find yourself inside cannons

So you'll know where you're headed if someone fires it? <G>

Posted by Rudolpho on December 8, 2006, 5:23 pm


B A R R Y wrote:
> Ramon F Herrera wrote:
>> DR is very useful when you find yourself inside cannons
>

Please have pity on people who aren't native speakers of the English
language.
--

Rudolpho
A program is never finished until the programmer dies.

Posted by Ramon F Herrera on November 26, 2006, 12:21 pm


mike vore wrote:
> Ramon F Herrera wrote:
> > Is dead reckoning, well, err, dead?
> You mean DED Reckoning - Deduced reckoning - taking a SWAG as to where you
> are. DEC Reckoning is one method of navigation, GPS is an aid to navigation
> where one gets occasional (with good signals Quite Often) fixes.

I am sure that "DED" has to be a marketing euphemism. Some marketing
guy (those who wear togas and hire harpists to conjure muses in
Dilbert) decided that it was a bad idea to sell a product with the word
"dead" to navigators.

Its the same case as "RAID", which stands for "Redundant Array of
Inexpensive Disks", but the word "Inexpensive" has been euphemistically
replaced by "Independent" in some quarters.

-Ramon


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