I've got three of them one was $1 at a g'sale. -pete "got to stop buying this crap" .. never
On Thu, Mar 3, 2011 at 1:06 AM, Joseph Gray <jg...@zianet.com> wrote: > Months ago a bought an old Delorme Tripmate for $5 (for that price, > why not?). Tonight I finally got around to fooling with it. After > finding out that it was designed to talk only to Delorme software > without some finagling, I got it to spit out NMEA data to Teraterm and > other programs. > > I discovered two things about the Tripmate. First, the sensitivity > sucks indoors. It is currently showing 13 satellites visible, but only > tracking three. Second, the time data from the GPRMC sentence is about > two seconds behind UTC (using my calibrated eyeball for measuring). > > Is the time delay simply due to a firmware error, a low priority > processing and outputting the NMEA data, or something else? > > I was going to attach the Tripmate to a modified Linksys WRT54G WiFi > router and make it an el-cheapo NTP server. No reason, other than just > for fun. Even without the two second delay, I know that the WRT54G > will not be a very accurate NTP server. I was assuming that I'd be > able to at least get better than one second accuracy, though. I guess > I can just put in a large fudge factor for ntpd to compensate. > > Unrelated to the above, I also have a Timex Ironman runner's watch > with mating GPS unit (another $5 purchase). The GPS is worn on the arm > and transmits data to the watch for displaying distance, speed, etc. I > need to get a battery for the watch, but I believe everything works. > Taking the GPS unit apart, I find that it is a Garmin. I see some > interesting test points on the circuit board, so I'm going to see if I > can get some serial data directly from the GPS, without using the > watch. > > Joe Gray > W5JG > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.