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Re: [TowerTalk] Compass and GPS

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Compass and GPS
From: Jim Lux <jimlux@earthlink.net>
Date: Wed, 04 Jan 2012 21:24:03 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 1/4/12 7:03 PM, Doug Ronald wrote:
> I should have excerpted all of K8RI's post, particularly this:
>
>
>
>> 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.
>
>
>
> Because the option to turn it on or off is programmed, it pretty much has to
> be a power hungry flux gate type.
>
>
>
> 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.
>

That's probably the iPad/iPhone/Android widget category...
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