I like gadgets. Everybody knows this. I also travel quite a bit, and have for years, and this isn’t news, either.

In my gadget-loving travels, I’ve had plenty of chances to use GPS systems, initially just the Hertz NeverLost system. Hertz’s Magellan-based car-mounted tool was fanTAStic in 2004, but has really not aged all that well. I didn’t really realize this until I had to use National in Kansas City this winter, which gave me my first exposure to the Garmin line.

I’d already seen and played with these units, and was pretty sure I’d choose a Garmin if I bought my own, and my early trips to Kansas City with National’s Garmins convinced me of that pretty handily. A touchscreen beats the Magellan’s interface all to hell, and having the unit on the dash makes more sense than keeping it in the passenger footwell, too. (National’s approach is also more flexible than Hertz’s, since they don’t mount the devices in the cars — renting with the GPS option means they just give you a little bag with the Garmin and its cables inside, which makes yield management easier for them.)

Of course, busy as I’ve been, I never bothered to actually go buy one — sure, it would be cheaper in the long run to own a $200 Garmin than to rent it for $15 or $30 a week, but the $30 is corporate money and the $200 wouldn’t be. Also, I really only needed them occasionally, and so I kept putting it off.

Then I bought a new iPhone this summer, and realized a purpose-built GPS is probably a dead letter. Google Maps + the internal true GPS of the 3G/3GS iPhones isn’t quite at Garmin quality levels, but it’s enough that I don’t need to spend another $200 or tote around another gadget. I’ve used it plenty to navigate in new cities or unfamiliar areas of Houston, and even without turn-by-turn, it’s absolutely good enough to make the idea of a Garmin redundant, at least for me.

The real head-scratcher, though, is this: We took the Benz in for some routine stuff last week, and the loaner car was a 2009 C-class. It’s a very nice car, to be sure, and comes with a fancy in-dash screen for managing various car features, including the built-in navigation system.

Which sucks. It’s unremittingly halfassed, and I’m sure constitutes a several thousand dollar add-in. An entry-level $149 Garmin beats it all to hell; shit, the outdated NeverLost system at Hertz is nicer and easier to use. What the hell?

It’s not just Mercedes, either. I have yet to see an original-equipment built-in GPS system that’s better in any way than the current crop of pocketable Garmins. Frankly, the iPhone’s drastically better and easier to use than any built-in, too, and gives the Garmin a run for its money. How long, though, do you reckon before carmakers get this news? Since Audi was still selling analog cell phones for $2000 in 1999, it seems likely we’ll see these things persist for quite some time.

Weird.