GPS Antenna Mounting

jeffsschwartz's Avatar

jeffsschwartz

19 Jul, 2013 11:27 AM

Hi Kevin,

Does the GPS antenna that comes with the 11AGPS need to be mounted externally? Also, if the GPS cable is not long enough, am I ok to use a co-ax extension or will that impact the quality of reception?

I'm planning on mounting the box in the main part of the cabin however if the GPS antenna needs to be installed externally I was planning on mounting it on the deck just above the transom.

Thanks in advance for your help.

Regards,
Jeff.

  1. Support Staff 1 Posted by kevin.dolan on 25 Jul, 2013 03:38 PM

    kevin.dolan's Avatar

    Hey Jeff,

    If it is a fiberglass boat then the GPS antenna can be mounted inside the boat. It is also OK to use an extension cable if you like but hopefully you can find a place under deck that does not have lots of metal above it and it will get a good view of the sky.

    Also in the iNavX app, in the instruments page there is a GSV Sentence. If you right arrow the GSV Gauge then you can see how the antenna is picking up the satellites. Give the GPS Box a little time to find your part of the world but after about 20 minutes on the first start up it will give you a good idea of how it sees the sky. Of course on subsequent start ups it will find the satellites much faster.

  2. 2 Posted by jeffsschwartz on 25 Jul, 2013 11:16 PM

    jeffsschwartz's Avatar

    Thanks Kevin,
    It is a fiberglass boat and I found an ideal spot; I mounted on the side of the cabin entrance just under the sliding top. When we're sailing the cabin top is open and the GPS has direct exposure, when the boat's put away it's covered up.
    I used it in last night's beercan race and it worked really well partway through then I lost the wifi signal, I was doing foredeck so I couldn't look into it but will try to see what's going on next week.
    Regards,Jeff.

  3. Support Staff 3 Posted by kevin.dolan on 26 Jul, 2013 04:09 PM

    kevin.dolan's Avatar

    Let us know if there is anything I can do on this end to help figure out the issue. You can always call or email if you need help

  4. 4 Posted by jeffsschwartz on 13 Aug, 2013 12:38 PM

    jeffsschwartz's Avatar

    Hi Kevin,
    I was able to look into it last Friday. The LED's on the box are no longer lighting up. I put a voltmeter on the bus that the power wires are connected to (both black and white are grounded) and it read 12.46 volts DC. I'm going to re-seat the power cables tonight to see if that helps.
    I didn't see a fuse inside the DMK box (the wire feeding +12V from my battery is fused), is there anything I can do to reset it?
    Regards,Jeff.

  5. Support Staff 5 Posted by kevin.dolan on 13 Aug, 2013 03:49 PM

    kevin.dolan's Avatar

    Hello Jeff,

    This has been happening to about 5% of our boards where the voltage regulator fails pretty early on. I will send you a new board. There is an online video outlining how to replace the DMK 11A board. To replace the GPS board you just need to also remove the GPS wire from the box and attach the new one with the O-Ring. Hopefully it is a cinch.

    Video Link: http://www.youtube.com/watch?v=8TyqXxjxZBs

  6. 6 Posted by jeffsschwartz on 14 Aug, 2013 02:44 AM

    jeffsschwartz's Avatar

    Thanks Kevin,
    I'll ship you the old board back once I get the replacement.
    Regards,Jeff.

  7. 7 Posted by jeffsschwartz on 19 Nov, 2013 02:13 PM

    jeffsschwartz's Avatar

    Hi Kevin,
    Now that my boat's out of the water for the winter I'm going to be doing some re-work on the boat electronics. I need to get a new wind instrument and will be setting up an NMEA2000 bus in the boat, I'm hoping to not have to replace my older Seatalk based depth/speed instruments since they are working fine.
    With respect to the DMK box, if I were to connect my old Seatalk instruments to the Seatalk port on the DMK box, would the DMK box convert the Seatalk signal to NMEA2000 and send the results on the NMEA2000 port of the DMK box or would it just combine the Seatalk with the NMEA 2000 over the wi-fi and not change what's on the NMEA2000 port?
    I'm asking since I have 2 options:
    1) Use the DMK box as a bridge to get the Seatalk messages onto the NMEA2000 network so that the NMEA2000 instruments can see the depth, boat speed, and water temperature messages from the old instruments.
    2) Purchase a Seatalk to NMEA2000 converter and then hang the DMK box off the NMEA2000 network.
    Thanks in advance for your help.
    Regards,Jeff.

  8. Support Staff 8 Posted by kevin.dolan on 19 Nov, 2013 04:54 PM

    kevin.dolan's Avatar

    Hey Jeff,

    This is why we developed and sell the box, but there are some shortfalls
    for your situation. We do not do bridging between Seatalk and NMEA 2000.
    In the WiFi Stream however, there is Seatalk to NMEA 0183 conversion.
    Right now there are not a ton of apps that can use native NMEA 2000 data.
    However iRegatta definitely works with native NMEA 2000 data. We are
    working though to help make the protocol more widely compatible with apps.
    But to get a Seatalk to NMEA 2000 conversion requires a separate
    converter.

    Seatalk NG has a sixth wire that is colored yellow in its wires. This wire
    transmits Seatalk data to Seatalk devices. If you are adding a permanent
    wired display, you may be able to feed it the native data without a
    converter.

    Kevin

    Kevin Dolan
    DMK Yacht Instruments
    Sales and Customer Support
    Cell: 206-450-5037
    www.dmkyacht.com
    <http://www.facebook.com/pages/DMK-Yacht-Instruments/290162601009567>

  9. 9 Posted by jeffsschwartz on 19 Nov, 2013 08:07 PM

    jeffsschwartz's Avatar

    Hi Kevin,
    Thanks for your help. I'll likely get a separate adapter to convert my Raymarine ST40 bidata to NMEA2000. That way all the data will be on 1 protocol. Right now, I'm only really using iRegatta on the tablet so that should work.
    Regards,Jeff.

  10. Support Staff 10 Posted by kevin.dolan on 19 Nov, 2013 08:11 PM

    kevin.dolan's Avatar

    iRegatta can use NMEA 0183 and NMEA 2000 streams side by side over WiFi so
    the only reason to add a converter would be if you wish to view everything
    on wired NMEA 2000 only screen.

    Kevin Dolan
    DMK Yacht Instruments
    Sales and Customer Support
    Cell: 206-450-5037
    www.dmkyacht.com
    <http://www.facebook.com/pages/DMK-Yacht-Instruments/290162601009567>

  11. 11 Posted by jeffsschwartz on 19 Nov, 2013 09:10 PM

    jeffsschwartz's Avatar

    That was the plan. The tablet display can be iffy in bright sunlight so I was also thinking of adding a B&G Triton T41 to the NMEA2000 network to show the wind stats. I'd then have iRegatta for the start line/layline/polars. Also that way I have the T41 as a backup if the tablet fails.
    Regards,Jeff.

  12. Support Staff 12 Posted by kevin.dolan on 20 Nov, 2013 03:33 PM

    kevin.dolan's Avatar

    I see now. Yes that needs a converter.

    Kevin Dolan
    DMK Yacht Instruments
    Sales and Customer Support
    Cell: 206-450-5037
    www.dmkyacht.com
    <http://www.facebook.com/pages/DMK-Yacht-Instruments/290162601009567>

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