Cafe closed, but left their wireless running...

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04:17 pm June 22nd, 2004

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			Mark Atwood

fallenpegasus


	Cafe closed, but left their wireless running...
	Well, my regular Tuesday cafe, "Christina's Espresso" at 85th & Greenwood has transitioned from "moderately inconvienient hours" to "not open when I'm here" to "Closed, space for lease". But strangely, the wireless internet access is still running... GPS: 47.69051°N 122.35850°W 71m

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	Comments

	From: juuro	Date: June 23rd, 2004 08:29 am (UTC)		(Link)

When you say "GPS" and give coordinates, which geodetic reference system are you using? For the altitude, is that to the ellipsoid, and if not, which geoid model?

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	From: fallenpegasus	Date: June 23rd, 2004 01:29 pm (UTC)		(Link)

My receiver is an Garmin eTrex. It's using the WGS 84 ellipsoid as it's reference system, and does altitude to that ellipsoid as well. The error between "reality" and WGS 84 in Seattle is less than the best typical accuracy I can get out of my eTrex (typically, 10 meters horizontal, which means 20 meters vertical), I'm not worried about the fine details.

I *do* wish that the this consumer grade unit had a mode where I could tell it "I'm going to put you down, and not move you for an hour, and I want you to get the best possible measurement."

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	From: juuro	Date: June 23rd, 2004 06:22 pm (UTC)		(Link)

My Garmin G12 has avereaging mode, which does precisely what you desire. And it is a consumer model. Predating the rage for map displays, though.

The longest averaging I've done was 36 hours, and there I was using an external supply. The AA batteries, claimed to provide 24 hours of use, in reality last less than 18 hours.

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