It should, but let me ask you, are you not getting a fix via the 740's internal antenna? That's a very sensitive antenna that I've seen get a fix mounted in an aluminum pilothouse on an Almar. If you tried and didn't get a fix, that's one thing, but I would power that thing up if you haven't, dollars to donuts you'll get a fix. No harm in trying! Good luck!
43 Tiara Open DDEC, GradyWhite 226, 18 Donzi Classic, 15 Boston Whaler Sport ETec 60
I do, but it installed in the dash of my Parker under 1 1/2" of plywood core plus pilot house top. Skyview only shows about 1/2 bars.
I also have a 540s that looses fix so I installed the external antenna and it drastically increase my accuracy. Looking to do the same with the 740s, plus I have a bare spot from my old furuno antenna that needs filling.