This 12-volt antenna (model number is Q7000619A) was recommended by Standard Horizon (SH) tech support for use with the GX2150 radio. This will give the radio position data.
At this time we have the SH VHF radio GX2150 to get position data from the Garmin chart plotter, the 740. The SH VHF sends the Garmin 740 Chart Plotter AIS data. This all works fine. The problem arises when we do not have the electronics on - that is a lot of the time! When the SH VHF has been on for 10 min with no position data (electronics off) then the radio sounds an alarm. This alarm keeps going off until it is cleared. Then after four hours the alarm goes off again, again it keeps going til it is cleared . This does not sound like much but every four hours means you are out in the dinghy or out on deck or napping in the cockpit and a trip to the nav station is required yet again. There is not a way to disable this alarm so there you are. After a couple few years of this we splurged for a way to get the damn radio what it wants, position data. This, I guess, is also a safety advantage if you press the red button :)
So now to install this antenna. We will mount it on the davits by the stern light. It comes with 25' of cord and our best guestament, this is long enough. We will put the little plastic mount that came with the antenna on the bottom of the antenna. We cut the connector of the end and now will need to wait for the rail mount to get here with Alan and Elizabeth on s\ v Vivacia. Other cruisers , Mike and Michelle on s\v Indian Summer brought down the antenna for us.
Inch by inch, but we are making progress :)
From Standard Horizon tech support:
OK got the response:
"It’s up to you which gps source you choose. You can wire them both to the radio and control them via a switch. The radio will always send AIS data in the format it receives them in from the transponders. The true or magnetic only affects what the display of the radio will show. "
Now when we get the rail mount we are good to go on this project!