Empathy List Archives

P

PRINTMORE1@aol.com

Fri, Dec 17, 2004 4:38 PM

Hi Keith: We have used the sextant for many years to obtain our position
while cruising in open waters. With practice (5000 sights) you will find this a
rewarding way to get a fix. With the availability of the GPS you can measure
your success on how close you can get. 1/2 mile to 1 mile is pretty good but
that takes practice in bringing the body to the horizon and taking the exact
time within 1 sec. Having the GPS is standard now but a sextant backup is a
requirement for off shore passages. Reducing the sights are now even easier
with specialized computer programs but you should also have the required
printed Nautical Almanac and tables (HO211 and/or HO249(latitude driven))., in
case the computer or calculator gives up. The modern sailor complains about
early rising (morning sights) and the time to reduce the sights but time is what
you have on long cruises. So good luck with your CN and enjoy seeing how
close you can get to an electronic fix (it's like playing golf). Regards. Leonard
Stern, Indifference

Hi Keith: We have used the sextant for many years to obtain our position while cruising in open waters. With practice (5000 sights) you will find this a rewarding way to get a fix. With the availability of the GPS you can measure your success on how close you can get. 1/2 mile to 1 mile is pretty good but that takes practice in bringing the body to the horizon and taking the exact time within 1 sec. Having the GPS is standard now but a sextant backup is a requirement for off shore passages. Reducing the sights are now even easier with specialized computer programs but you should also have the required printed Nautical Almanac and tables (HO211 and/or HO249(latitude driven))., in case the computer or calculator gives up. The modern sailor complains about early rising (morning sights) and the time to reduce the sights but time is what you have on long cruises. So good luck with your CN and enjoy seeing how close you can get to an electronic fix (it's like playing golf). Regards. Leonard Stern, Indifference

HW

Hal Wyman

Fri, Dec 17, 2004 10:55 PM

Speaking of which, there was a short article in the papers yesterday to the
effect that the Government has contingency plans to shut off GPS if it
thinks it necessary to reduce the risk of attack.

Hal

Speaking of which, there was a short article in the papers yesterday to the effect that the Government has contingency plans to shut off GPS if it thinks it necessary to reduce the risk of attack. Hal

MM

Mike Maurice

Fri, Dec 17, 2004 11:19 PM

At 02:55 PM 12/17/04 -0800, you wrote:

Speaking of which, there was a short article in the papers yesterday to
the effect that the Government has contingency plans to shut off GPS if it
thinks it necessary to reduce the risk of attack.

Such information appears to be somewhat in error. What the President asked
for was a plan for disabling GPS, most likely in a selected area. There is
NO such plan at present. Since the request was made public by the
government, it implies that they expect feedback from the user community
and for the DOD to create the plan, therefrom. Based upon feedback and
technical factors. The mere fact that such a plan were to exist, would be a
deterrent to anyone planning to attempt to use the GPS system. Which lowers
the risk of having to implement the plan in the first place.
The planning is a good idea from a security standpoint, and as I pointed
out decreases the chances of their being any disruption, whether SA or by
complete disabling.

Mike

Capt. Mike Maurice
Tualatin(Portland), Oregon

At 02:55 PM 12/17/04 -0800, you wrote: >Speaking of which, there was a short article in the papers yesterday to >the effect that the Government has contingency plans to shut off GPS if it >thinks it necessary to reduce the risk of attack. Such information appears to be somewhat in error. What the President asked for was a plan for disabling GPS, most likely in a selected area. There is NO such plan at present. Since the request was made public by the government, it implies that they expect feedback from the user community and for the DOD to create the plan, therefrom. Based upon feedback and technical factors. The mere fact that such a plan were to exist, would be a deterrent to anyone planning to attempt to use the GPS system. Which lowers the risk of having to implement the plan in the first place. The planning is a good idea from a security standpoint, and as I pointed out decreases the chances of their being any disruption, whether SA or by complete disabling. Mike Capt. Mike Maurice Tualatin(Portland), Oregon

MS

Michael Slavitch

Fri, Dec 17, 2004 11:24 PM

Localised GPS jammers are nothing new, in fact they are too easy to make.

On Fri, 17 Dec 2004 15:19:52 -0800, Mike Maurice
mikem@yachtsdelivered.com wrote:

At 02:55 PM 12/17/04 -0800, you wrote:

Speaking of which, there was a short article in the papers yesterday to
the effect that the Government has contingency plans to shut off GPS if it
thinks it necessary to reduce the risk of attack.

Such information appears to be somewhat in error. What the President asked
for was a plan for disabling GPS, most likely in a selected area. There is
NO such plan at present. Since the request was made public by the
government, it implies that they expect feedback from the user community
and for the DOD to create the plan, therefrom. Based upon feedback and
technical factors. The mere fact that such a plan were to exist, would be a
deterrent to anyone planning to attempt to use the GPS system. Which lowers
the risk of having to implement the plan in the first place.
The planning is a good idea from a security standpoint, and as I pointed
out decreases the chances of their being any disruption, whether SA or by
complete disabling.

Mike

Capt. Mike Maurice
Tualatin(Portland), Oregon

Passagemaking-Under-Power Mailing List

--
Michael Slavitch
Ottawa, Ontario Canada

Localised GPS jammers are nothing new, in fact they are too easy to make. On Fri, 17 Dec 2004 15:19:52 -0800, Mike Maurice <mikem@yachtsdelivered.com> wrote: > At 02:55 PM 12/17/04 -0800, you wrote: > >Speaking of which, there was a short article in the papers yesterday to > >the effect that the Government has contingency plans to shut off GPS if it > >thinks it necessary to reduce the risk of attack. > > Such information appears to be somewhat in error. What the President asked > for was a plan for disabling GPS, most likely in a selected area. There is > NO such plan at present. Since the request was made public by the > government, it implies that they expect feedback from the user community > and for the DOD to create the plan, therefrom. Based upon feedback and > technical factors. The mere fact that such a plan were to exist, would be a > deterrent to anyone planning to attempt to use the GPS system. Which lowers > the risk of having to implement the plan in the first place. > The planning is a good idea from a security standpoint, and as I pointed > out decreases the chances of their being any disruption, whether SA or by > complete disabling. > > Mike > > Capt. Mike Maurice > Tualatin(Portland), Oregon > > _______________________________________________ > Passagemaking-Under-Power Mailing List > -- Michael Slavitch Ottawa, Ontario Canada

K

Keith

Sat, Dec 18, 2004 1:23 PM

I'm pretty sure Navy ships do localized GPS jamming... Have any of the rest
of you seen your GPS go crazy near a Navy ship? Anyway, one part of the plan
mentioned is to make the GPS system more resistant to jamming, except of
course by us.

P.S. Mike: Great post on weather windows... archive material. I did wonder
though... what do you use to whip your crew? ;-)
See random sigline below... I think that ap has a mind of it's own.

Keith
__
Good judgment comes from experience. Unfortunately, the experience usually
comes from bad judgment.
----- Original Message -----
From: "Michael Slavitch" slavitch@gmail.com

Localised GPS jammers are nothing new, in fact they are too easy to make.

I'm pretty sure Navy ships do localized GPS jamming... Have any of the rest of you seen your GPS go crazy near a Navy ship? Anyway, one part of the plan mentioned is to make the GPS system more resistant to jamming, except of course by us. P.S. Mike: Great post on weather windows... archive material. I did wonder though... what do you use to whip your crew? ;-) See random sigline below... I think that ap has a mind of it's own. Keith __ Good judgment comes from experience. Unfortunately, the experience usually comes from bad judgment. ----- Original Message ----- From: "Michael Slavitch" <slavitch@gmail.com> > Localised GPS jammers are nothing new, in fact they are too easy to make.

JH

John Harris

Sat, Dec 18, 2004 1:51 PM

I have NEVER encountered GPS jamming in various trips through NY harbor,
Norfolk harbor and Chesapeake Bay entry, Miami, and a variety of military
facilities along the Gulf and east coast, including an encounter with a US
Sub 400 miles east of South Carolina.

I hope I never do.

John Harris

I have NEVER encountered GPS jamming in various trips through NY harbor, Norfolk harbor and Chesapeake Bay entry, Miami, and a variety of military facilities along the Gulf and east coast, including an encounter with a US Sub 400 miles east of South Carolina. I hope I never do. John Harris

RR

Ron Rogers

Sat, Dec 18, 2004 6:22 PM

Although this is unlikely to impact long-range passagemakers, cruisers in
the Pacific Northwest (PNW) have lost their GPS signal in proximity to the
"boomer" base in the State of Washington as well as when in proximity to
some USN ships. Here on the East Coast, a Local Notice to Mariners this past
July warned of the loss of both GPS and cellular signals on the ICW near
military bases in SC and NC. It was billed as a test. No mariner I spoke to
suffered a loss of signal.

Ron Rogers
Willard 40 AIRBORNE
Lying Annapolis

----- Original Message -----
From: "John Harris" JohnPH@Comcast.net

|I have NEVER encountered GPS jamming in various trips through NY harbor,
| Norfolk harbor and Chesapeake Bay entry, Miami, and a variety of military
| facilities along the Gulf and east coast, including an encounter with a US
| Sub 400 miles east of South Carolina.
|
| I hope I never do.
|
| John Harris

Although this is unlikely to impact long-range passagemakers, cruisers in the Pacific Northwest (PNW) have lost their GPS signal in proximity to the "boomer" base in the State of Washington as well as when in proximity to some USN ships. Here on the East Coast, a Local Notice to Mariners this past July warned of the loss of both GPS and cellular signals on the ICW near military bases in SC and NC. It was billed as a test. No mariner I spoke to suffered a loss of signal. Ron Rogers Willard 40 AIRBORNE Lying Annapolis ----- Original Message ----- From: "John Harris" <JohnPH@Comcast.net> |I have NEVER encountered GPS jamming in various trips through NY harbor, | Norfolk harbor and Chesapeake Bay entry, Miami, and a variety of military | facilities along the Gulf and east coast, including an encounter with a US | Sub 400 miles east of South Carolina. | | I hope I never do. | | John Harris

MM

Mike Maurice

Sat, Dec 18, 2004 6:22 PM

At 07:23 AM 12/18/04 -0600, you wrote:

P.S. Mike: Great post on weather windows... archive material. I did wonder
though... what do you use to whip your crew? ;-)

A Cat-o-Nine Tails, of course. They claim they aren't afraid of anything else!
I trust this subject won't come up again, as I am trying to keep this
method quiet.

Mike

Capt. Mike Maurice
Tualatin(Portland), Oregon

At 07:23 AM 12/18/04 -0600, you wrote: >P.S. Mike: Great post on weather windows... archive material. I did wonder >though... what do you use to whip your crew? ;-) A Cat-o-Nine Tails, of course. They claim they aren't afraid of anything else! I trust this subject won't come up again, as I am trying to keep this method quiet. Mike Capt. Mike Maurice Tualatin(Portland), Oregon

PJ

Philip J. Rosch

Sun, Dec 19, 2004 2:56 PM

Last fall, they were jamming around Camp LeJeune but they posted it in the
notice to mariners. My ship's icon on the CAPN rotated 45 degrees, but the
course seemed right on.

                                      Regards....

Phil Rosch
Old Harbor Consulting
M/V Curmudgeon MT-44TC
Currently moored in Man-O-War Cay, Bahamas

Last fall, they were jamming around Camp LeJeune but they posted it in the notice to mariners. My ship's icon on the CAPN rotated 45 degrees, but the course seemed right on. Regards.... Phil Rosch Old Harbor Consulting M/V Curmudgeon MT-44TC Currently moored in Man-O-War Cay, Bahamas

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