"John is correct, and the unit will reset to its defaults when power is removed. The command will have to be sent to the unit after each power up. Wait a half second or so to ensure the GPS is booted and in the mood to receive commands.
"
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Eric Frank
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Nav Speed Threshold for the MT3329 GPS unit
Started this discussion. Last reply by Ken May 11, 2012. 3 Replies 0 Likes
With my recent (November 2011) purchase of the MT3329 GPS receiver from DIY Drones, it may have the Nav Speed Threshold set so that the positional information is not updated if the unit is not…Continue
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John Bond replied to Eric Frank's discussion Nav Speed Threshold for the MT3329 GPS unit"Yes, it's on by default and set to 1 meter per second.
You can find the command reference here:
http://www.adafruit.com/datasheets/PMTK_A08.pdf
$PMTK397,1.0*3C <= 1 meter per…"
Dr B Holt replied to Eric Frank's discussion Nav Speed Threshold for the MT3329 GPS unit"Check http://diydrones.com/forum/topics/gps-position-hold-in-quadcopter. ; It has a string to set it to 0.2 m/s. I used it and it worked."
Eric Frank posted a discussionNav Speed Threshold for the MT3329 GPS unit
With my recent (November 2011) purchase of the MT3329 GPS receiver from DIY Drones, it may have the Nav Speed Threshold set so that the positional information is not updated if the unit is not moving. In other online discussions (for example, SparkFun), it appears that this threshold can be set or turned off with a $PMTK command (397). But this command is not listed in the PMT commands referred to on the DYI site. Will the unit I got from you accept this command? Is it ON by default?See More
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