Author Topic: Garmin thread  (Read 10322 times)

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ijen

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Garmin thread
« on: January 23, 2011, 04:17:28 PM »
Post your Garmin tips or questions here. I'll start.

My 500 has recently been taking forever to find a satellite. Anything I can do?

Offline Wylde06

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Re: Garmin thread
« Reply #1 on: January 23, 2011, 04:30:09 PM »
Do you turn it on outside?


That would be my only guess...ive only had my 500 for about a month now so I can only guess, but it locates them faster outside than in for me.

Offline rando

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Re: Garmin thread
« Reply #2 on: January 23, 2011, 05:02:57 PM »
This may be a little too geeky for a consumer device but it may be however the unit computes declination.  It may also help to set it on level ground as this helps with triangulation by giving a static position equable to actual elevation.  I spent a year or so dealing with some equipment dependent on GPS navigation and barometric sensors that was about as techy as civilians can take possession of.  Lots more math and detailed setup than I imagine Garmin asks of its consumers. 


Being near an airport or other larger equipment trying to do the same task is the first thing to look into as being at sea level you are nearly at the furthest point from space you will realistically be on earth.  This limits the amount of satellites and complicates telemetry. 


Also deposits of metal in the area can be problematic during occasional parts of the earths rotation.


See if garmin lets you into some advanced function that allows input of or shows a value for magnetic declination and check it against this   
« Last Edit: January 23, 2011, 05:06:28 PM by randonneuse »

Offline Wylde06

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Re: Garmin thread
« Reply #3 on: January 23, 2011, 05:08:13 PM »
This may be a little too geeky for a consumer device but it may be however the unit computes declination.  It may also help to set it on level ground as this helps with triangulation by giving a static position equable to actual elevation.  I spent a year or so dealing with some equipment dependent on GPS navigation and barometric sensors that was about as techy as civilians can take possession of.  Lots more math and detailed setup than I imagine Garmin asks of its consumers. 


Being near an airport or other larger equipment trying to do the same task is the first thing to look into as being at sea level you are nearly at the furthest point from space you will realistically be on earth.  This limits the amount of satellites and complicates telemetry. 


Also deposits of metal in the area can be problematic during occasional parts of the earths rotation.


See if garmin lets you into some advanced function that allows input of or shows a value for magnetic declination and check it against this


wut
 

Offline rando

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Re: Garmin thread
« Reply #4 on: January 23, 2011, 05:15:11 PM »
Simply put where you are on earth has a different magnetic pull than at the North or South pole which are opposites.  In order to properly orient a compass you need to know the offset of magnetic North to plug in to get true North which GPS is dependent on to get an accurate fix. 

Offline rando

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Re: Garmin thread
« Reply #5 on: January 23, 2011, 05:16:31 PM »
Just play with the thing till it acts sensible.  These have a limited range and lifespan before the delicate electonics get out of whack. 

Offline <gmt>

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Re: Garmin thread
« Reply #6 on: January 23, 2011, 05:19:53 PM »
GPS doesn't use magnetic compass. It gets a fix by triangulation in 3D from radio signals
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Offline LAJ

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Re: Garmin thread
« Reply #7 on: January 23, 2011, 05:22:06 PM »
Make sure you are running the current software, ijen. Should be 2.6. Also, shutting it off then turning it on sometimes helps.
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BLR_0719

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Re: Garmin thread
« Reply #8 on: January 23, 2011, 05:24:16 PM »
Is randonuesse talking about the poor mans Garmin?


Offline rando

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Re: Garmin thread
« Reply #9 on: January 23, 2011, 05:24:25 PM »
Which requires having the correct magnetic declination.  I'm not saying it is as simple as putting current to a piece of metal but thats pretty much what a GPS is if you simplify it enough.

Offline rando

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Re: Garmin thread
« Reply #10 on: January 23, 2011, 05:25:13 PM »
What is Yoshi doing in that picture?

Offline <gmt>

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Re: Garmin thread
« Reply #11 on: January 23, 2011, 06:07:06 PM »
Which requires having the correct magnetic declination.  I'm not saying it is as simple as putting current to a piece of metal but thats pretty much what a GPS is if you simplify it enough.


no.  it isn't.


it's a radio receiver.  all pertinent data comes from the satellite network.  if they wanted to they could make S into N by changing the data on the satellites.
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ijen

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Re: Garmin thread
« Reply #12 on: January 23, 2011, 06:14:06 PM »
Make sure you are running the current software, ijen. Should be 2.6. Also, shutting it off then turning it on sometimes helps.

Software is current. I'll try the other  :thumbsup:

Offline rando

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Re: Garmin thread
« Reply #13 on: January 23, 2011, 06:21:46 PM »
Oh, I'm pretty sure if you can check it against a database that is updated to reflect the small year to year changes in the value you can verify the single most important variable of any navigation.  In ijens case the memory of her GPS could very easily not calibrate the positioning accurately enough.  Most GPS require at least 7 satellites and ideally 14 to properly lock a position.  The ability to boost the gain of her internal antenna is less likely than forcing a correction of the telemetry software. If you verify the electronics are working properly that leaves only environmental concerns which are less likely.

Offline rando

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Re: Garmin thread
« Reply #14 on: January 23, 2011, 06:24:31 PM »
Wow, grumpy we made it a whole week in our separate corners.  And here I was concerned with you being a mod and all :thumbsup: