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  • Satellite Locking

    This morning I, as usual when I wear both, turned on the 310 and the 305 virtually simultanously and put them together on the windowsill while getting ready for a run. I turned both of them on using down arrow + on (though I'm not sure it matters for the 310).

    Anyways, the 305 took its usual time (not very long), but the 310(!) took a long time, and finally complained and wanted to now whether I was indoors or had moved far away since last. I said no to both (technically I was of course indoors in my apartment, but that has never been a problem for neither the 305 nor the 310).

    This was a disappointment. I certainly don't expect the 310 to be worse than the 305 in locking satellites.

    Perhaps one should NOT hit down arrow while powering on the 310, and let the surf chip ride the those waves freely without intervention?
    DISTANCE: 3000M___ - 5000M___ - 10000M__ - 21098M_ - 42195M_ --- Current VDOT: ?
    PB______: 10:50,09 - 18:40,20 - 38:39,00 - 1:25:39 - 3:10:26

  • #2
    Using the down arrow when turning on the unit will dump the satellite cache and force it to find satellites from scratch. Same for the 310 and the 305.

    Strange that the 310 took longer though.

    April
    http://www.enduranceriderblog.com

    Comment


    • #3
      Is there some reason you clear the sat cache on a usual basis or was this some kind of test you were performing? Kind of defeats the purpose of the sat cache (speedier sat locks)...
      Anthony

      My GC Digest

      Comment


      • #4
        I've only done the satellite reset once when comparing the 205 to 310. That was only because of issues the 310 was having in tracking my activity. Since then it has been fine and I have not reset it again.

        From the old forum (erroneous question marks included, just for old times sake )

        Quote from: seilogramp on June 24, 2009, 08:08:28 pm
        Quote from: fourbeer on June 24, 2009, 08:05:19 pm
        That 310xt track does not look very good.? I was hoping for at least 205 performance.? Bummer.

        Yeah, I'm hoping this can be improved with a reset of the satellites on the unit. Also, I'm not sure if the GPS chipset can be tweaked for better performance.

        Today was much better for the 310XT. I cleared the cached satellites on both units, not being totally sure that the same reset combination (hold down arrow while powering on) would work on the 310XT. Both units registered roughly 15 - 16 feet GPS accuracy. Will report details later.
        Also, from the old forum...

        I just now played around with sat acquisition with the 310. Not sure how you had your 310 resting. As you know it's hard to get it to balance with the band in the way. If you have it just resting on its own, it will not be at its best angle for reception. The x05 is at a better angle just resting. With the face of the 310 parallel with the earth I got 18' accuracy, with it perpendicular to the earth I got 20', and with it at a 45 degree angle I got 15' accuracy. This is good, since the normal running position is going to be with the watch tilted at ~45 degree angle.
        Phil M.
        myConnect | StravaHeatmap | Instagram
        F201 F205 F305 FR50 310XT 920XT
        nüvi 67LMT

        Comment


        • #5
          Anecdotally, my 310 seems to acquire satellites faster than my 305 did, but I don't do the side-by-side comparisons that you do so I can't say for sure. If I have time this afternoon I could do a comparison.

          So far, I've only had one bad experience with losing satellites:

          http://connect.garmin.com/activity/7934318

          I'm thinking that when it lost signal, it was only the third or fourth time I had used it, so maybe I had never cleared the cache, but I don't remember.

          Since then I've run through more tree-covered paths without any problems. I've also started monitoring my GPS accuracy while I run, and it varies from ~14 feet (wide open skies) to ~30 feet (tree covered trails), which the typical range being ~22 to 28 feet. I don't know how this compares to my FR305, but it's better than I get with my Edge 305, which is typically ~30 feet but will often creep up to 60 feet or higher if I'm riding my road bike down a tree-covered road while in the drops with my body blocking the unit.

          Comment


          • #6
            I repeated your experiment, but I was outdoors instead of indoors. I did it two or three times, and in each case, the 310 locked onto the satellites faster than the 305, and had reached better accuracy than the 305.

            After doing that test, I went for a trail run. I set one of my screens to monitor GPS accuracy. Almost my entire 7-mile run was in dense forest, and I was down in some low spots with small hills around me. GPS accuracy was was usually better than 23 feet, and I don't think I ever saw it greater than 26 feet. So, ever since I had my bad experience the second or third I used my 310, it's been solid ever since.

            One thing I've noticed is that when I've had GPS failures, it's occurred shortly after I received the unit. This actually happened to me yesterday during a mountain bike ride with an Edge 305 I had just received as a warranty replacement for my other Edge (which had developed a broken lap button). After my ride, I did a complete reset, so hopefully it will work better next time. Anyway, I'm starting to form a theory that whenever we receive a new device, we should first do a complete reset to clear everything.

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            • #7
              Originally posted by DW152 View Post
              I repeated your experiment, but I was outdoors instead of indoors. I did it two or three times, and in each case, the 310 locked onto the satellites faster than the 305
              It should. The 310 uses SiRFInstantFixII.
              Phil M.
              myConnect | StravaHeatmap | Instagram
              F201 F205 F305 FR50 310XT 920XT
              nüvi 67LMT

              Comment


              • #8
                Same problem today. 305 locks normally, 310 looks, and looks, and looks, and finally gives up and asks me if I'm indoors, etc.

                I'm doing a hard reset today. No problems, since there's nothing in memory that I haven't got elsewhere.
                DISTANCE: 3000M___ - 5000M___ - 10000M__ - 21098M_ - 42195M_ --- Current VDOT: ?
                PB______: 10:50,09 - 18:40,20 - 38:39,00 - 1:25:39 - 3:10:26

                Comment


                • #9
                  Originally posted by ALAALA View Post
                  I'm doing a hard reset today.
                  Is this your first hard reset since getting your 310? Have you just been doing the satellite reset?
                  Phil M.
                  myConnect | StravaHeatmap | Instagram
                  F201 F205 F305 FR50 310XT 920XT
                  nüvi 67LMT

                  Comment


                  • #10
                    What firmware version and GPS version does your unit say it has on it? (Settings//About Forerunner)
                    Anthony

                    My GC Digest

                    Comment


                    • #11
                      Originally posted by SEILOGRAMP View Post
                      Is this your first hard reset since getting your 310? Have you just been doing the satellite reset?
                      Yes, it became the first time I did a hard reset (Mode+On).
                      This last time I didn't hit down button on either the 310 or the 305.
                      DISTANCE: 3000M___ - 5000M___ - 10000M__ - 21098M_ - 42195M_ --- Current VDOT: ?
                      PB______: 10:50,09 - 18:40,20 - 38:39,00 - 1:25:39 - 3:10:26

                      Comment


                      • #12
                        Originally posted by kansaiben View Post
                        what firmware version and gps version does your unit say it has on it? (settings//about forerunner)
                        2.40/2.10
                        DISTANCE: 3000M___ - 5000M___ - 10000M__ - 21098M_ - 42195M_ --- Current VDOT: ?
                        PB______: 10:50,09 - 18:40,20 - 38:39,00 - 1:25:39 - 3:10:26

                        Comment


                        • #13
                          If the hard reset didn't work, you'll want to be in contact with Garmin CS as your software numbers look current. Could be you may have corrupt GPS software and a reinstall may help, or you may have a faulty antenna and need a replacement.
                          Anthony

                          My GC Digest

                          Comment


                          • #14
                            Locking and looking

                            Well, yesterday, and today, the 310 at least didn't look blindly, but I must say that it isn't much, if at all, better than my 305 either in finding sats fast or keeping them.

                            In fact, I've noticed that the 310 seems to lose itself more often than the 305. The units go side by side, so to speak, for some kms but sometimes the 310 has jumped 40-50 meters ahead in quite a short time. I'm not so sure it's about how the GPS track is laid out as much as how the internal correction algorithms works.

                            I'd be interested in knowing if anyone has found something similar?

                            I certainly hope its a software problem (if it is a problem at all, and not just pure coincidence due to the aligment of the stars 2543,57 light years to the left of the far side of Endor), because then it should be possible the fix without messing with returns.
                            DISTANCE: 3000M___ - 5000M___ - 10000M__ - 21098M_ - 42195M_ --- Current VDOT: ?
                            PB______: 10:50,09 - 18:40,20 - 38:39,00 - 1:25:39 - 3:10:26

                            Comment


                            • #15
                              I'd be interested in knowing if anyone has found something similar?
                              Nothing quite as bad as you've experienced. I did not get the 310 expecting it to be better at tracking. In my comparison tests, it is at least as good as the 305. I did expect it to lock on faster. It at least does that.
                              Phil M.
                              myConnect | StravaHeatmap | Instagram
                              F201 F205 F305 FR50 310XT 920XT
                              nüvi 67LMT

                              Comment

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