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      A Few Simple Rules   05/22/2017

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percam

Nexus MOB Function

6 posts in this topic

I'm trying to get the MOB function working on my nexus gear but not getting the results I expect.

I have a nexus log and wind transducer and a gps aerial(garmin 17x_HVS) feeding the FDX server. Output is to a multicontrol display and nexus classic wind display. Everything is operating ok.

When I push the MOB button, I get an alarm, the multicontrol display goes blank (no data) and "D/R" appears in the bottom rh corner. I've changed settings on the multicontrol display but always get the same result. Any suggestions.

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I got a good number of NX2 instruments including FDX Server. I do not have a seperate MOB button!

 

Did you install a seperate MOB button?

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They sell a generic button that can be used for the trim functions or MOB. The button gets wired directly to terminals on the FDX server. Mine always goes into 'dead reckoning' mode on the multifunction displays when the button is pushed, although the manual says it should be in GPS mode if a GPS 'navigator' is connected. Maybe this is true only if the Nexus GPS unit is used -- in my setup I have GPS data fed to the Nexus via NMEA.

 

The D/R actually works, I have tested it in simulated MOB trials. Arguably, in an area with current and windage/leeway, it is better than a GPS fix as the MOB will be drifting.

 

Here is the button itself. http://www.chicagomarineelectronics.com/NX2_Remote_Push_Buttton.htm

 

ac91_pushb.jpg

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I bought a couple of waterproof pushbutton momentary switches from ebay, not as neat as the switch above but more suited to my budget. I've wired it up so i can easily change from MOB to trim function but need a compass for that to happen. I'm on the look out for a nexus compass to connect to the server if anyone has one to offer.

Pogen, good to read your MOB works with D/R. That is the better option. I don't think the GPS aerial is my problem as the Garmin outputs the same nmea sentences as the nexus. I'm reading position and SOG/COG data on my multicontrol display ok also outputting position details to the DSC VHF radio so the GPS data is being processed in the server. I'm guessing one of the settings is not correct. Instead of D/R appearing on the screen, I think I should be getting MOB.

I haven't tried using waypoints on the nexus system as i use my handheld gps or laptop for navigating. I'll try this soon as it may lead to the solution I need.

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I contacted nexus, for the MOB button to work with the GPS, the navigator display unit is required. Thats not how I was reading the multicontrol instrument manual. So now my options are to get a nexus compass, find a another use for the button, or buy the navigator (unlikely).

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