iFly GPS Forum

I hope someone can answer these questions:

1. Is the 740b any faster than a 740?

2. Is the 740 battery replaceable? And available? (This user is not afraid of soldering irons, etc.)

Why do I ask? Because an ancient 740 is my all-time favorite GPS navigation device. I use it every time I fly--several times every week. And it's semi-permanently installed in the instrument panel, right where it ought to be--and also drives the autopilot.

On the other hand, it needs a new battery and its processor is rather slow, especially compared to the iPad Mini 6 that I use as a supplemental backup.

So I'm thinking of buying a 740b, rather than enduring the downtime from sending the 740 to AP for repair.

You're probably right.

But when the b model first came out, I asked AP's tech support if it was better than the 740 and was told that it wasn't. But they didn't offer any specifics--and I noted that the 740's display is "1300 nits"--compared to the b model's "1100." So I didn't buy. So now you see I'm looking for the specs.

I am also under the belief that the only difference between a 740 and the 740B is the screen brightness, but cannot find information to prove that. 

AP had a very reasonable flat rate (around $35 at one time) to repair the 740. I assume that they still do. You could call them and see what it would cost and how long to replace the battery. Could be a quick turnaround.

There was a discussion on this site about someone replacing the battery themselves with a larger battery. They did have to modify some of the plastic that held the battery in place, but seemed pleased with the results. AP will warn you that this is an unauthroized modification.

Another option is to get a small external 12V backup battery. AP used to sell one, but I don't believe they do so anymore. You can purchase an equivalent from other sources.

Good luck.