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Joined: 02/11/2002 22:41:59 Posts: 11878 Location: Massachusetts, USA
Posted: Thu Nov 20, 2003 4:28 pm Post subject:
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... _________________ Lutz
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