I'm not sure I see a reason for Garmin to buy Raymarine, unless it is the international market, where Raymarine may be stronger.
Garmin has made strides in the last 5 years in diversifying their product. 5 yaers ago I wrote an article and said that Garmin wanted to be Raymarine (Raymarine would like to be Furuno, Lowrance would like to be Garmin). Garmin is now getting close to having a line up as diverse as Raymarine's, and is actually stronger in the smaller units. With the aquisition of TR-1 Garmin now has an autopilot, and they came up with an instrument line, so I'm not sure what Raymarine has that Garmin doesn't already have.
Garmin may feel that the Raymarine line is more accepted in the yacht market, but I'm not so sure that is the case as much as it used to be. I've been seeing some Garmin product on larger yachts, so there is beginning to be some acceptance of the product. Furuno is still the standard bearer for the yacht market, and nobody has the commercial line that Furuno has.
I think what Navico went through in the last few years should be a cutionary tale, as they aquired Lowrance / Eagle, Simrad and Northstar. Trying to run three seperate divisions and prices points, with shared chasis didn't work so well. Northstar is now gone, existing only as a label on the new Simrad NSE network units (NSE stands for Northstar Edition).
So could Garmin offer Raymarine as a seperate line of products? Why would they? Everyone would know that Raymarine was owned by Garmin, so those resistant to the Garmin brand would be as resistant to Garmin built Raymarine units.
The offer by FLIR makes more sense, as it gives a compnay in the marine electronics field the ability to have a complete product line without having to grow a new brand name.
The one thing I think Garmin should make a bigger deal of is their aviation product. The fact that a marine product is built by a company that can build product that meets rigid FAA requirements would be strong marketing tool- and yet it is never mentioned in Garmin's advertising.
As always, my 2 cents.