NMEA Settings

[MrT]

I have seen the recommendations for the NMEA settings in Winfast of GGA=1, GLL=0, GSA=5, GSV=5, RMC=1 and VTG=1.

Can someone explain why these values are optimal and what the effects are of tweaking them?

[lbendlin]

Depends on the program you want to use. Many of the sequences deliver redundant information, so you can also live without some of them

GGA - time, position, fix quality, number of sats tracked, altitude - all you need except speed

GLL - just gives you Longitude and Latitude, redundant because this is also in GGA and RMC

GSA - active satellites - useless for navigation, needed for displaying how many sats are fixed

GSV - sats in view - useless for navigation, needed for the fancy sat graphics

RMC - time, position, speed - all you need for navigation!

VTG - track made good and speed , slightly redundant

So if you can live without fancy pictures then all you really need is RMC=1 and GSA=5

And If you don't care how many active sats you have then all you really need is RMC=1

Side note: There is an interesting problem every now and then when some receivers decide to be smart and set themselves to RMC=1 automagically - this will then have users scratch their heads and wondering why they see no sats but navigation still works fine...
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Lutz

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