Garmin GPS 24xd: inexpensive Heading data to stabilize charts, radar, and AIS

Ben Stein

Ben Stein

Publisher of Panbo.com, passionate marine electronics enthusiast, 100-ton USCG master.

18 Responses

  1. Allan Seymour says:

    Ben could you explain in more detail your statement” GPS 24xd is not a good replacement ” for traditional heading sensors ? I just ordered one and hope it will also replace my Airmar heading sensor. The additional location accuracy might also be helpful in some of those tight places we like to go into here in Penobscot Bay. Im hopeful that the data from the new surveys might be incorporated on the new Garmin chips I just acquired . I seem to remember a vessel last summer.

    • Ben Stein Ben Stein says:

      Allan,

      With what applications are you planning on using the sensor? In speaking with Garmin they indicate that for an autopilot you’re better off with a more advanced heading sensor. Also, although they press Release mentions MARPA there seems to be some equivocation on that.

      -Ben S.

  2. Allan Seymour says:

    Hi Ben, on the SallyW I have Garmin chart plotter , radar , Airmar heading sensor a Airmar weather sensor , a GPS 19 and a Amec wide link B600 ais. My objective is to keep the system simple and yet keep it as accurate as possible without alerting the wife as to spending. Occasionally the chart plotter waffles as to which heading device it uses even tho I tell it. Plus or minus 3 degrees of heading seems to be quite adequate to me as I now see shifts of the heading line lots more than that. So I figured the GPS24 might stabilize the heading , Marpa and give me better position accuracy. I guess I’ll have to see. Plus I am a slow boat, LNVT at 7 knots. Interested in your thoughts.

    • Ben Stein Ben Stein says:

      I suspect you’re going to be pleased with the results. I’ve reached out to Garmin for a little more context on the MARPA performance with this sensor and once I hear I’ll update you.

      -Ben S.

  3. Allan Seymour says:

    And I will let you know what I find as well. Spash is May 17.

    • Ben Stein Ben Stein says:

      Allan,

      I’m working on another Garmin heading sensor review and was reading through these comments. Any update on how your GPS 24xd is doing for your use?

      -Ben S

      • Kevin Lee Kevin Lee says:

        Hi, Ben,

        I just got back from a trip from Marathon to Punta Gorda. I replaced the 19x on Leeway with a 24xd before the trip. I did not calibrate the compass since I have a Garmin Reactor A/P and use the 9-axis heading sensor from that.

        Regarding the accuracy of the 24xd, I regularly had accuracy of 2.5 feet or better. I’m very pleased with the performance. If you already have a 19x the swap is about two minutes – unscrew the old and attach the new.

        Kevin

      • Allan Seymour says:

        Don’t think I am using it properly . When boat is not moving forward the heading is all over the place. When underway it now points more accurately where I am pointing. The position accuracy is really good.

  4. Ben Stein Ben Stein says:

    When I first published this entry I failed to mention the increased accuracy the 24xd offers by making use of the new L5 GPS frequency. I added some information about the increased accuracy and the L5 frequency above.

    -Ben S.

    • Kevin Lee Kevin Lee says:

      Thanks for the review, Ben. I’m installing the 24xd on Leeway today. It’s replacing the Vesper AIS GPS antenna. I’ll now have a 19x (that will now be used by the AIS) and a 24xd for my three 12″ Garmin chartplotters. Since I have a Garmin Reactor autopilot with the 9-axis heading sensor on Leeway, I bought the 24xd for the increased accuracy.

      • Ben Ellison Ben Ellison says:

        Other Ben here, Kevin, wondering how you can replace the Vesper AIS GPS when I think it’s required that all Class B transponders have their own GPS? I believe the Vesper will be able to use the 24xd Heading data coming over NMEA 2000, but would have thought that it’s already doing the same thing with the Reactor Heading sensor data?

        • Kevin Lee Kevin Lee says:

          Hi, Ben. I’m aware Class B transponders need their own dedicated GPS antenna/source. I am hoping to use the current 19x on Leeway for the AIS and the new 24xd for non-AIS GPS source. Primarily want to replace the Vesper GPS antenna because Vesper has lousy UV inhibitors in their plastic and the antenna has yellowed terribly where the Garmin (and most other plastic on the hardtop) has remained white. In prepping for the swap, I see the Vesper antenna uses an SMA connector, so I either need to find an adapter or just replace the 19x with the 24xd and keep the Vesper.

          You’re right about the heading data already on the backbone courtesy of the Reactor sensor. I’m changing to the 24xd because of the better accuracy. I won’t be using the heading data.

          Thanks,
          Kevin

      • Kevin Lee Kevin Lee says:

        Just swapped out the 19x for the 24xd. GPS accuracy improved – now about 4′. I haven’t taken Leeway out to calibrate the heading sensor alignment. Not a big deal since I already have a better heading sensor onboard.

  5. Andy says:

    Interesting choice for the second frequency, L5 that is.

    Most consumer grade dual frequency receivers have been L1 + L2 so far. A bit better availability for L2 signal, but I guess Garmin sees L5 more suitable for aviation purposes, and the availability will be there, just a few years behind L2.

    Still waiting for the first triband receiver for a reasonable price!

  6. Christopher says:

    Satellite compass from Garmin .

    https://buy.garmin.com/en-US/US/p/702588

  7. Dan Barthel says:

    How does this compare to the Furuno SCX-20 Satellite Compass?

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