Your issue may be as follows:
In order to enable the tooltip to function with Observation data (ships and buoys) it is first necessary to disable the tooltip that operates the same way for grib file data. Weather / Tooltip; make sure it is not gray-shaded by clicking on it.  

On one boat that I race GPS data is obtained from a Garmin 1040 GPS/Chart Plotter that, for one reason or another, will only transmit COG in magnetic, which forces us use magnetic throughout our navigation systems. In that boat's Nexus system I use the FDX connection and in order to get the Nexus magnetic HDG to agree with the Expedition magnetic HDG I set the correct magnetic variation in Nexus and then set an opposite value in Expedition (Exp cals - Hdg [check the box then set the value]).

My thinking (quite possibly flawed) was that Expedition was obtaining the magnetic variation value from the chart and combining / compounding it with the magnetic HDG obtained from Nexus (which might be incorrectly identified by Nexus in the transmission) to produce a magnetic HDG with a doubled magnetic variation.

After performing the massage described above I check to insure that Nexus and Expedition are producing the same magnetic HDG and then check that number against what is shown with a handbearing compass.     

There is probably a better way of dealing with the issue and I am open to suggestions which might reflect an accurate conceptual understanding.   

Hey Ernie,
Thanks. I thought that might have been it but sometimes I am unable confirm that. If that is your understanding then I will keep crunching until I understand how that works out.
Again, thanks.

My notes and recollection concerning the H3000 emphasize two "operating modes" each with a different Serial and Network port settings in Expedition and each with a different Communications Port Configuration setting in the H3000 CPU.

Polar data can be sent to the CPU from Expedition only if the "Communication Port Configuration" in the CPU is set to "1-0-2" (H-Link). If you are sending Bearing To Waypoint data to the CPU then you must necessarily be using "1-5-2" (NMEA) as that configuration because that BRW cannot be sent in the H-Link mode.

If I am not mistaken then the H3000 Communication Port Configuration setting is accessed through this path: CALIBRATION / OTHER CALIBRATION / MISC / COMM CONFIG.

A note: after you have set the configuration it may be necessary to shut down the B&G and repower it to insure that the new Communication Port Configuration has been "accepted" by the CPU.

After you have transferred the polars then it will be necessary to reset the Communications Port Configuration to "1-0-2" (NMEA) in order to transfer "real time" BRW data again.     

I hope this helps and I apologize if this is something that you have already handled and I did not discern it in the thread.   

Get it.
It's like Expedition in that the more you use it the better you get with it and the more you come to like it.
Also, incident to acquiring proficiency with MA you come to get better at accessing sources of WX information and developing a sense of the strength and weaknesses of various gribs.
I have had the good fortune to speak to two of the developers at the arm's length and they are committed to making MA increasingly user-friendly and to that end they actively solicit user input.
Get in on the ground floor and participate in the discussions that will make it better.