I always loved geology and geography when I was in school and have kept up my interest over the years. Living in Arizona, we've got plenty of interesting geography, from mountains and deserts to fascinating road cuts and huge canyons that reveal geologic ages gone by.

Now, someone has created what I would say is the ultimate app for Geography/Geology amateurs and professionals.

I've been using Geology AZ, [iTunes link] which for US$4.99 overlays a whole lot of information on a basic map of the state. You can add town and cities, roads, counties; you know, the usual stuff you find on maps. Then you can dive much, much deeper, with maps of new and old fault areas, earthquake sites, old and current mines, public lands, fire history, and nicely rendered terrain elevation maps. I'm just scratching the surface here, so to speak. You can go to the developer web site and get a lot more information about what is available.

You use standard finger gestures to zoom in and out, and the level of detail is amazing. The items on the map are color coded, so you can tap something and get a lot more detail. You can use the iPhone's built-in GPS to plot your position on the map, and find out all sorts of interesting features that are near you. Thankfully, I'm not living on a fault line.

You can also capture one of your custom maps and output it in high resolution to your computer. If you're not interested in Arizona there are currently maps of Oregon/Washington, California, Texas, Florida and New York, with other states on the way. You can check them out here.

This is a great tool for education, enjoyment, or a heads-up about what geological formations or geographical highlights are near you. You can change the transparency of each layer, superimposing data across several layers of the map.

I can't say enough about how clever this app is, and the price is very reasonable considering the mountains (pun intended) of data it contains.

The Arizona map data is about 42MB, and using the app does not require any data from your cell provider. It runs on either the iPhone or the iPod touch, but getting a GPS fix is only possible on the iPhone.

Check the gallery for some screen shots and click here to see a video of this app in action.:

Well, another day, another iPhone GPS app is released to the eager hordes. One of the latest entries is CoPilot Live [iTunes link]. Note: CoPilot Live is also available in a version for the U.K. at the App Store.

The North American version is a US$34.99 full featured nav for your car, bicycle, or just walking around. All the maps are built in, so it does not require any data, which is a plus.

There are things I like about this app, other than the low price. The screens look good, and are highly configurable. They give you the option of getting live weather at your current location, or your destination. I'd like to see that on every GPS app. Satellite acquisition was quick, with no glitches. Although some users have reported crashes, I found the app stable and reliable.

The voice instructions are very clear, and you have a choice of several languages with either a male or female speaker. In the U.S. the choices are 'John' or 'Lisa.'

You can zoom in or out of the 3D or 2D maps, and it appeared that as you approach a destination the map zooms in automatically. The app quickly switches to portrait or landscape mode, and you get a full screen, large type indication of the next turn. It pops up for a few moments, then returns to map view.

The app allows you to plan a trip in advance and preview the route. Happily, you can choose a destination from your address book.

Of course, things aren't all rosy with CoPilot Live. Here are the issues I saw in a couple hours of driving around town.

During a recent weekend afternoon drive from Los Angeles to San Diego, I was stuck in heavy traffic -- unusually heavy considering the day and time I was traveling. Sure, I could have relied on dedicated apps, such as iPhone's built-in map app or MapQuest 4 Mobile, to see exactly where the traffic would loosen up, but I wanted to know exactly what was causing the traffic. So I turned to sigalert.com instead.

We didn't want to let the week slip into the weekend without mention of the long-awaited release, on Thursday afternoon, of Google's Latitude client for iPhone, allowing users to update their locations to the social service and keep track of friends and family on the move (otherwise known as "iStalkU" -- no, sorry, that was Loopt, my mistake). You can access the service by browsing to http://google.com/latitude on Mobile Safari on your iPhone or iPod touch.

Yes, that's right, browsing. Latitude, believe it or not, is a web app -- which means that you can't get push notifications about your contact's movements, or keep constant tabs on folks without leaving Safari running. Intriguing. As Google's Mat Balez notes in his blog post announcing the Latitude release, Google actually developed a native app for Latitude... only to have Apple, uh, suggest that the big G redo the concept as a web app to avoid user confusion with the Maps app. Really? Must have been an interesting phone call.

David Coursey at PC World is frustrated with the limitation, and it's hard to fault him. Meanwhile, location-centric apps like Brightkite are already on the store -- of course, they are also kneecapped by the lack of a backgrounding mode to send updated position fixes.

If you're a Latitude fan, give us your feedback on the new web app below.

Thanks to everyone who sent this in.

While many have been waiting for the TomTom hardware/software combo for the iPhone, Navigon has delivered a very appealing app for the iPhone running version 3.0 of the OS.

MobileNavigator [App Store] has a striking on-screen display, with many features lacking in some of the other products that are out there. Unlike the AT&T Navigator and the G-Map apps, MobileNavigator allows you to access your address book for destinations. It works in landscape or portrait mode, and can warn you if you are speeding. It does not have any traffic info, and you can't call any phone numbers that are in the POI (points of interest) data base. A take me home function is done with a single click.

All the maps are loaded on your device (1.29 GB) so going out of range of an AT&T cell site is not a worry. If you get a call, the guidance stops, but resumes automatically when you conclude the call.

Maps can be 3D or 2D, and the 3D maps look great and closely mimic what is on the road in front of you. The voice directions are quite clear, in contrast with the AT&T app, which is garbled and pretty much a waste.

So how is it on the road? Pretty nice. I got a quick GPS lock. If for any reason you lose GPS, in a tunnel for example, you get a red bar across the top of the screen.

You can display POIs along your route, and many of the icons have company logos like Best Buy, most of the gas station logos, even Quiznos.

If you are navigating the next street to turn on is at the bottom of the screen. If you are not navigating, you see the street you are on. At the top of the screen you get the arrival time if you are navigating. Touching that part of the display will give you your speed, and another touch gives you the distance. Many streets alert you to the speed limit, and if you go go over, you can set a warning.

Intersections on highways are handled very well, with nice big road signs and clear directions of where to go. The voice directions come at the opportune times, and do not nag, the way the AT&T app does.

At my location, southern Arizona, the maps were complete and there were far more POIs than provided on the G-Map application.

It looks like our European friends will get first crack at an advanced turn-by-turn navigation app for the iPhone/iPod touch. MobileNavigator Europe [App Store] requires the 3.0 software, and looks to be fully featured:

• 2D and 3D map displays
• Can be used in portrait and landscape format
• Branded UI features such as Reality View Pro, Lane Assistant Pro & "real signpost display"
• Speed Assistant with adjustable audio-visual warning
• Direct access and navigation to contacts saved in the iPhone's address book
• The latest NAVTEQ maps, 2M+ European POIs (points of interest)
  
• Navigation is automatically resumed after an incoming phone call
• Quick access to user-defined POIs in the area and along the route
• Take Me Home function with a single click

This software is the first of several apps coming for the iPhone. The TomTom app that will work in the U.S. has been demoed and coming soon. Garmin, one of the premier GPS manufacturers is going the other way, and will release their own phone with navigation built in, but the project has been troubled and much delayed. Telenav has pre-announced its iPhone offering and suggested that customers keep an eye on the company's Twitter feed.

The Navigon app is US $94.99 (!) this month only, then the price goes up (!!!). The Navigon website doesn't yet show a list of the supported countries, but it's displayed in iTunes and is quite extensive (Albania to Vatican City with Estonia, Macedonia, San Marino & Slovenia + more in between). The app supports ten different languages and will automatically switch based on the selected language for the iPhone itself. The download weighs in at 1.65 GB.

This quick release of high quality navigation software should set mouths watering for a release over here, but I'm a bit troubled by the pricing, as you can buy a pretty fully featured low-end navigator for only a few more dollars.

Update: Our readers have also mentioned Gokivo, with a continuing US$9.95 a month subscription, and Sygic, which provides turn by turn navigation in Austrailia and New Zealand.

Thanks to Gaspare for the original tip and our alert readers for more suggestions!

One of the highly touted features of the new iPhone is the ability to have the map display your direction of travel. A great idea, long overdue. As people were walking out of the Apple Store today it was one of the first things some people wanted to try. They brought up the Google Map app, and then started spinning around. But these whirling dervishes weren't getting anywhere.

Since I was the real smart TUAW dude, I told them I could get it going. Nope. Nada. Zero.

After a bit of a search at the Apple web site when I returned home, I found it. You have one more tap to do on the map. When you tap the location icon at the lower left of the map screen a second time, it changes to a new, previously unseen icon. It looks like a little wedge in a circle. When you activate it, you're good to go. Or spin.

I think if I were designing this I would have made it an option on the map to default to direction of travel, or North at the top. Oh well, nobody asked me. Not the most obvious GUI design, but I guess once you know it, you know it. Now you know it too.

iPod touch users are finally getting a taste of what iPhone users have had since iPhone OS 2.2: Google Street View. iPhone 3.0 Software Update for iPod touch includes an update to the Maps application that enables Google Street View, and it works just like it does on the iPhone.

Additionally, the "Find my iPhone" feature is implemented as "Find my iPod touch" for iPod touch users. It works exactly like Megan described yesterday, but is perhaps less accurate than using the iPhone's built-in GPS. It'll at least get you close, so long as it's connected to a Wi-Fi network. If it is, you can send messages to the iPod touch and wipe its memory.

If you do send a message to an iPod touch that's turned off or not connected to a Wi-Fi network, the message is queued until it's on and connected.

Both features appear to work on both first- and second-generation iPod touch devices. As Megan mentioned, since the first-generation iPod touch lacks a speaker, it won't make the "ping" noise associated with Find my iPhone unless you have speakers plugged in. Perhaps less useful for finding it in the house, but still helpful if you left it on a table at the park.

Have you found an undocumented feature that the iPhone 3.0 Software Update for iPod touch provides? Let us know by tipping us, or leaving a comment.

Thanks, Harold, Ben, Rocky, and everyone who sent this in!

HearPlanet Premium [App Store link] is a new and enhanced version of the free iPhone app HearPlanet. The premium version is U.S. $5.99.

HearPlanet Premium gets your location from GPS, or you can enter any location manually. It then provides quite a bit of text information, generally sourced from Wikipedia. HearPlanet can tell you what is around you, like tourist locations, museums, geological features, and read the descriptions out loud, or you can read them yourself without the audio. The app has worldwide coverage.

We took a look at the original HearPlanet and found much to like. Apparently, we weren't alone, as 300,000 copies of the travel app have been downloaded. One of the most requested features from users was maps, and now HearPlanet contains detailed maps of many locations. The maps are sourced from the Open Streets Map project, and are quite attractive to look at. Other similar apps can link you to Google Maps, but they throw you out of the program. HearPlanet Premium has everything in one place.

When you find locations, there are often thumbnail images that go with an entry, but you can't enlarge them. One of my suggestions for the free app was the inclusion of phone numbers, pretty important in a travel guide, but since the source of much of the information is Wikipedia, there still aren't many phone numbers that I could locate. The developer says there are phone numbers, and as data sources are added the amount will increase.

The maps allow you to zoom and pan, giving you a good idea of what is around you. You can reference the maps while the program is speaking, and the ability to look around while learning about a location is very nice. HearPlanet premium is a nice upgrade from the free version, which is still available at the app store. If you want the addition of maps, HearPlanet Premium is the way to go.

HearPlanet and HearPlanet Premium both run on the iPhone or iPod touch. Of course the touch does not have GPS, but it can usually derive your location via Skyhook's WiFi capability.

Check out a few screen shots in the gallery below:

AroundMe [App Store link] has always been a must have app for my iPhone. Now it has been updated to make it even better. Since it's free, having it on your phone is a no-brainer.

In this latest edition you can chose a category of places, e.g., restaurants, hospitals, supermarkets and so on. You then get the usual list of destinations closest to you, along with a web site if one exists, and a phone number.

If you click on the map button, you'll get a split screen with a map showing the closest 4 destinations, along with your current location. In the lower half of the screen, you get the usual list of the closest locations. This new feature is really helpful in visualizing where your destinations are, as the closest might not always be the most desirable. The 'nearby' function allows you to link to Wikipedia entries for things around you like museums or historical sites.

AroundMe runs on the iPhone and iPod touch, and requires iPhone software version 2.2 or greater. It supports English, French, German, Dutch, Italian, Portuguese, Russian, Spanish and Swedish.

There are other apps that have similar functions, but I keep coming back to AroundMe because it is fast, is usually very up to date via Google info, and is easy to use.

Geotags [App Store link] is a free map-based application for the iPhone. Its purpose is to keep a geographic diary of sorts, letting you mark maps with tagged information you'll want to explore again.

You can geotag your car so you can find it again, or a favorite hunting location, or a cave. I tested the app by recording some favorite spots in a nearby state park that were good photographic locations.

It's a bit like Places in iPhoto, but it is portable. You can add photos to geotags, or an audio clip (2 minutes max recording time for each clip) that describes it, and of course some written notes.

Once you have built up a database of tags, it can all be exported to Google Earth for sharing with friends, or just to use yourself.

I found the app is a really good start, but it feels more like a beta than a finished, polished program.

The icons chosen for different functions are a bit arcane, and this is not an app you can use as soon as you download it. Expect to spend some time in the help file, which, happily, is built in. Geotags uses Google maps for data, and it pulls the maps into the Geotags interface.

There doesn't seem any way to sync the tags to your computer, so if you lose the iPhone, or buy a new one, you have to start again. I don't think this is a limitation of the Apple SDK, and it would be a good idea for the developers to support standard sync through iTunes. If you really start using this app, losing everything would be pretty dreadful. Update note: Our astute readers say while there are kludges, there is no easy way within the SDK to sync the data.

I don't like to complain too much about Geotags, because it is free and pretty much works as advertised. On the other hand, it seems a few versions short of a really useful product. The concept of the wheel interface, with icons that are hard to understand, needs a thorough revising. I also noticed that the maps and features were constantly refreshing, which can really get old fast. It stops the app dead while that is going on, and frankly, I don't know why it is constantly doing it.

There isn't too much on the market exactly like this program, so give it a try at no cost, and hang around for some updates. The developers have improved the application since it was released late in December and they seem open to suggestions in their community forums.

With a little cleaning up, especially of the visual aspects, I think Geotags will eventually be a winner. I found some good uses for it the first day out, and I think many others will too.

Here are some screen shots:

Following up on our report yesterday, a new tipster sent us screenshots of the Maps and Safari applications, highlighting changes on the way in iPhone firmware 2.2.

Apple looks like they're maximizing the income they make from offering a Google search option by cramming a search box in next to the address field. In the current firmware, the search field only appears when the address field is tapped.

As we mentioned yesterday, Google and Apple have also worked out a way to include Google Street View. It doesn't work quite the way I thought, but is much like Android's implementation nevertheless: Tapping on an icon of a human torso (according to our tipster) rotates the screen and displays Street View. Then, you can pan around the scene with your finger, in a 360-degree panorama. Our tipster says "the entire experience feels snappier than 2.1, very very fast in general."

Soon to be available in Maps is a new "Share Location" button that drafts an email with a clickable link. Handy for when you want to find friends after you've split up.

As always, if you have screenshots or tips you'd like to send in, please do!

Update: Because there was some confusion as to what we meant by "torso," a new image showing the icon has been added to the gallery below.

This morning I took a stroll through the free bin in the App Store and found Earthscape [App Store link here] was, for a limited time, offered as a free download (it is now back to $4.99). I would pay a couple of bucks for Earthscape, although it isn't much more than a neat tech demo and didn't appear to serve any practical purpose. It is neat, but not essential.

The app is like a miniature version of Google Earth, minus street maps and not quite as "3D" or functional.

For a complete walkthrough of the app and its features, check the gallery.

Planning some activities out on the town this weekend, or searching for a Mother's Day dining option? The fine folks at Schmap have a treat for you -- they'd like TUAW readers to have the first whack at their new iPhone City Guides and Local Search before the Mobile Safari-optimized site goes into official beta on Monday, May 12.

Point Safari on your iPhone or iPod Touch to www.schmap.com, then enter the pre-launch preview access code: 724627. Once you're in the site, pull up a Schmap Guide for your favorite city for info, maps, and more. Some of the search features aren't wired in yet, but they should be done soon.

Schmap's website has several Flash demos of the features of the Schmap Guides for iPhone. Check it out!

Thanks to Donald at Schmap for the invitation, and Kyle for the tip.