kevin.dolan on 25 Jul, 2013 03:38 PM
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
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
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.
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?
kevin.dolan on 13 Aug, 2013 03:49 PM
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.
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.
kevin.dolan on 19 Nov, 2013 04:54 PM
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
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
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.
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.