David Taylor wrote: > The new Garmin 3.70 firmware which corrects the problem
I agree, the new version 3.70 at last does not suffer from excessive NMEA latency. It looks like our messages to Garmin finally got through David. Last night I did a 12 Hr test of the NMEA latency with the new 3.70 version firmware for the Garmin 18x. I measured the time of the "START" character ($) of the $GPRMC sentence and the "LAST" 0x10 (Linefeed) character, relative to the leading transition of the 1PPS, GPS 18x set to 4800 Baud. Times are in "milliseconds" wrt previous 1PPS Version 3.20 firmware for Garmin 18x *** Previous GOOD version *** START Min = 370 START Avg = 433 (N = 7200) START Max = 518 LAST Min = 519 LAST Avg = 582 (N = 7200) LAST Max = 667 Version 3.70 firmware for Garmin 18x *** NEW June 2011 *** START Min = 333 START Avg = 413 (N = 43,402) START Max = 491 LAST Min = 482 LAST Avg = 562 (N = 43,402) LAST Max = 640 So no more 1 second slow ! Regards, Geoff , Christchurch, New Zealand. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
