SiRF XTrac - Pro's and Con's!

[Dave]

For more information on XTrac, check out our article "XTrac or No XTrac" by clicking the image below.

[jlw]

When are you guys using XT, and when you you using ST mode?

[Privateer]

Hi JLW.

I never use XT mode. I always use ST mode on my Fortuna Clip-On when driving with TTNav.

Basically, you should start off with the GPS receiver in ST mode and try it. If you’re walking or you’re in an urban canyon then you might want to try XT mode.

Regards,
_________________
Robert.
iPhone 6s Plus, iOS 14.0.1: iOS CamerAlert v2.0.7
TomTom GO Mobile iOS 2.3.1; TomTom (UK & ROI and Europe) iOS apps v1.29
Garmin Camper 770 LMT-D

[jlw]

[RobStevens]

I generally use ST for driving, but recently I had to switch to XT when I failed to get a lock after waiting several minutes.

I still don't know why ST didn't work that day. I was stationary, in an open car park with a good view of the sky. It was raining, with very thick cloud overhead, so maybe that was it. XT worked fine, and ST has worked since (in better weather).

So, keep a pin handy if the weather looks bad...

[imapbox]

[Wilko]

Found a .PDF on the Sirf website explaining Xtrac a little HERE (1.46MB)

[bazza_c]

ST mode works well in most situations, but I find that it doesn't always work too well on trains, planes or in cars with sintered windscreens, even if you previously had good satellitte lock before entering the vehicle. XT tends to work in all environments, but the speed readout is 5 to 10s slower than ST mode, despite the fact that screen position appears to be pretty spot on -strange that.

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