What do different GPSfix enumerations mean

Any DA40 related topics

Moderators: Rick, Lance Murray

Post Reply
User avatar
OriensFlight
3 Diamonds Member
3 Diamonds Member
Posts: 91
Joined: Thu Mar 15, 2018 2:59 pm
First Name: Hans
Aircraft Type: DA40
Aircraft Registration: N556LU
Airports: KHES
Has thanked: 85 times
Been thanked: 48 times

What do different GPSfix enumerations mean

Post by OriensFlight »

In the G1000 logs, field 'GPSfix' has a number of possible enumerations. Does anyone know where they're documented? Or do you know what they mean?

NoSoln = No Solution, I suppose.
3D = Appears to come on first during startup, and eventually switches to:
3DDiff = which seems to be the correct enumeration for flight.

I've also seen:
DRWAAS = which appears to have you lose ALT, but not GroundSpeed or GPS fix.
Hans
N556LU / 40.763 - 2007 DA40 XL G1000 w/WAAS, SVT, TAS & ADS-B @ RAM Aviation in Healdsburg, California
User avatar
Boatguy
5 Diamonds Member
5 Diamonds Member
Posts: 1828
Joined: Mon Jan 22, 2018 4:48 am
First Name: Russ
Aircraft Type: DA62
Aircraft Registration: N962M
Airports: KSTS
Has thanked: 1329 times
Been thanked: 1163 times

Re: What do different GPSfix enumerations mean

Post by Boatguy »

NoSoln = not enough satellites to determine a location
3D = four satellites, the minimum to get a fix in 3 dimensions
3DDiff = 3D corrected with data from a ground station, aka SBAS or WAAS in the U.S.

DRWAAS. My guess is that DR stands for dead reckoning, using heading and speed to estimate a lat/lon position, but not 3D, no altitude. I'm not sure why it would include WAAS as a component in a DR fix.
Post Reply