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Old 03 June 2009, 08:42   #1
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VHF and GPS problem

I have just bought a used rib which has on the console a Navman 7100 VHF and Lowrance 335C GPS. When I switch on the VHF, a sound rather like a telephone ring tone emits from it, which increases in volume the longer you leave it! How do I cancel it?
The GPS does not have an SD card in it and when you switch that on it has a warning notice on the screen to advise not to rely totally on the GPS - how do I cancel this message?
Also, how do I know if the VHF and GPS are synchronised for DSC functioning?
Grateful for any info on this.
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Old 03 June 2009, 09:29   #2
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Can't help much but you'll know if the DSC is working as it will give your position, time and date on the radio. This comes from the GPS.
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Old 03 June 2009, 09:33   #3
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The tone you are getting is because the radio is not getting the lat & long from the GPS. It is a warning tone, because without the postion information, the DSC function is worthless.

You can cancel by pressing the ESC button.

The above will answer your last question, they are not working together. As I dont have your GPS I cannot comment specifically, but would summise that without a card in it, it is not giving position information.
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Old 03 June 2009, 10:15   #4
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Have you tried (Google is your friend):

http://www.navmanmarine.net/upload/M...VHF_Screen.pdf

http://www.lowrance.com/en/Downloads/Manuals/
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Old 03 June 2009, 10:27   #5
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I suspect that the NEMA cable from the GPS to the VHF is not connected properly. It may be worth mentioning that the GPS will need to be turned on before the VHF for a few minutes to get a "lock", or the VHF will chime to warn you about no GPS data after a few minutes. Irritating but harmless.

The positional data should appear on the LED screen of your VHF and match that on the GPS. Your VHF can also be set via it's menu to display Speed and Heading data from the GPS.

The GPS should supply your position data without the Chart card. The warning cannot be changed, it's there to get them off the hook in court if you pile into a rock!

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Old 03 June 2009, 15:20   #6
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Navman VHF & Lowrance GPS

Thanks folks for the tips. It's my first day on the Ribnet site and hope my problem has been solved. Will check it out at the weekend when I get home.

I did download the manuals, but the Navman was useless and the Lowrance manual is 192 pages filled with loads of legal Americanese gobbledegook.
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Old 03 June 2009, 18:36   #7
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I have the Lowrance 339, on this you hit the exit button to get past the disclaimer warning. The unit wont try to get a GPS location until you get past the warning. It will give you an alert on the screen saying 'position acquired' after a few seconds, then you should see your position appear on your VHF.
If you dont want to hear the annoying noise, turn your GPS on and exit past the disclaimer before you turn on your VHF.
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Old 07 June 2009, 07:18   #8
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clearing warning on GPS

We tried this but did not work! Someone else has said that we need to perform a factory restore, so I will endaevour to find that in the online manual.
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Old 07 June 2009, 11:12   #9
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You'll probably have to get the radio back to a dealer or factory anyway, as the MMSI will need changing to match you licence.
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Old 07 June 2009, 11:49   #10
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Originally Posted by havener View Post
You'll probably have to get the radio back to a dealer or factory anyway, as the MMSI will need changing to match you licence.
Sorry to pick you up on this Havener but your wrong on the MMSI bit.

What you do is go into the Ofcom website and register a change of ownership to the existing MMSI so that your details are recorded against it instead of the previous owner.

The MMSI is locked to the radio and should be handed from owner to owner.

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