[TowerTalk] Compass and GPS

[K8RI]

On 1/4/2012 10:03 PM, Doug Ronald wrote:
> I should have excerpted all of K8RI's post, particularly this:

Ah... That wasn't my post.  I think mine came before it.

73

Roger (K8RI)
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>> My Garmin Vista H has electronic compass separate
>> from GPS. (not all Garmin do) so it has some kind of
>> magnetic sensors.
>> I know I can turn it on and off separately, to save battery power.
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> Because the option to turn it on or off is programmed, it pretty much has to
> be a power hungry flux gate type.
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> There are MEMS devices with 20 nW power consumption which the manufacturer
> wouldn't bother to power down. With<= 0.3 mT field sensitivity, one can
> make a handy compass out of one of them.
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>
> -Doug Ronald (AE6SY)
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