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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I just found this thread and used the program they linked to updated my date and time on my Garmin GPS III (not plus). It took me two tries but I got it to work. The unit shows the proper date and time now. For the record I had replaced the internal battery a couple of years ago. If you have had a unit sitting in storage with no working batteries in it for a long period of time your internal battery may be dead. I believe the GPSII+ has a rechargeable internal battery that should recharge after being hooked up to power for a day or so.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><a href="http://forums.gpsreview.net/discussion/29425/garmin-gps-iii-plus-date-problem">http://forums.gpsreview.net/discussion/29425/garmin-gps-iii-plus-date-problem</a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Brian N2KGC<span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> aprssig [mailto:aprssig-bounces@lists.tapr.org] <b>On Behalf Of </b>Stephen H. Smith via aprssig<br><b>Sent:</b> Wednesday, April 24, 2019 12:51 PM<br><b>To:</b> TAPR APRS Mailing List<br><b>Subject:</b> [aprssig] GPS Epoch Rollover Findings<o:p></o:p></span></p></div></div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>GPS expresses the current time and date with a?? series of binary counters.?? This included a 10-bit binary counter for the current week, meaning that it could only count 1024 (decimal) weeks (just under 20 years) before rolling over from 1111111111 to 0000000000, and starting over.?? This 1024-week cycle is known as an "epoch".?? The previous epoch ended on April 6th of this year.?? As of April 6th, a 16-bit counter for weeks replaced the 10-bit one.?? This change will put off the NEXT epoch rollover for 65,535 weeks - about 1200 years. </span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>Some older GPS hardware (actually firmware) couldn't handle either the rollover from 1023 back to 0000, or couldn't handle the new longer 16-bit counter format.?? Such devices quit working on April 6th of this year.?? </span><o:p></o:p></p><p style='margin-left:.5in'><o:p> </o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>Now that the GPS equivalent of "Y2K" (April 6th) has come and gone, here are my findings testing a bunch of older GPS hardware.</span><o:p></o:p></p><p style='margin-left:.5in'><o:p> </o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>-???? Radio Shack "DigiTraveller" (a faceless serial puck-type device that looked like a flying saucer) -?? DIED</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>-???? Holux GM-200?? USB-connected faceless mouse-type device - DIED</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>-???? Rand McNally serial mouse-type device - DIED</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>-???? 2nd-gen Delorme Earthmate small yellow unit with interchangeable serial and USB cables (not the original large Earthmate) - DIED</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>The Holux and Rand-McNally are visible in this pic on my website:<br>???????? <a href="http://WA8LMF.net/aprs/GPS-Antenna-Farm.htm"><http://WA8LMF.net/aprs/GPS-Antenna-Farm.htm></a></span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>-???? Tri-M "Super Skymaster"?? white hard-mount combo antenna/receiver (shown in the inset photo of the above pic) survived and WORKS.?? This is especially amazing, given that it was the oldest of all these units.</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>- ?? Globalsat BC-337 compact flash/PCMCIA unit - DIED?? </span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>-???? Garmin Foretrex 201 wrist-wearable that is actually a repackaged version of the classic yellow Etrex - WORKS</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>-???? Globalsat BU-353 (USB) and BU-355 (serial) mini-pucks available for USD $30 on Amazon - WORK</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>-???? Various unbranded generic units based on uBLox G7 chipset - WORK </span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>-???? Internal GPS of Kenwood TH-D72 APRS handheld - WORKS</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>__________________________________________________________________________________</span><o:p></o:p></p><p style='margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>\Stephen H. Smith?????? wa8lmf (at) aol.com </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in'><span style='font-family:"Arial","sans-serif"'>Skype:?????????????? WA8LMF<br>EchoLink: ?? Node #?? 14400?? [Think bottom of the 2-meter band]<br>Home Page:?????????????????? <a href="http://wa8lmf.net">http://wa8lmf.net</a><br><br>Live Off-The-Air APRS Activity Maps<br>???? <a href="http://wa8lmf.net/map"><http://wa8lmf.net/map></a><br><br>Long-Range APRS on 30 Meters HF <br>???? <a href="http://wa8lmf.net/aprs/HF_APRS_Notes.htm"><http://wa8lmf.net/aprs/HF_APRS_Notes.htm></a></span><o:p></o:p></p><p style='margin-left:.5in'><o:p> </o:p></p><p style='margin-left:.5in'><o:p> </o:p></p><p style='margin-left:.5in'><o:p> </o:p></p><p style='margin-left:.5in'><o:p> </o:p></p></div></body></html>