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I don't know what the Garmin 40 is. This Garmin works fine. I had a Garmin unit years ago when they first came out. Most recently I had a Magellan stolen out of my car, but Best Buy did not have one available. This Garmin has some nice features/upgrades from other GPS's I've owned. Not only shows my speed accurately, but also displays the speed limit for the zone currently passing through; Nice. The other day I had to take a "Lyft" ride and the driver was using the GPS on her cell phone. It did not show enough detail on the lanes available and I had to advise her many times on which lane she should get into for upcoming moves. Sorry I don't know about the basic question you asked.
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