It's finger friendly and showing the map on fullscreen. GPS support and GSM triangulation (if no GPS device is present) is built in.

The downloaded map tiles are stored on your phone/storage and only new ones are downloaded.

Requirements:
- Windows Mobile 5+ Professional.
- .NET CF v3.5.

Recommendations:
- GPS (built-in or external).
- Internet Connection.

The software works well even if you don't meet the recommendations. You can still download the map tiles with your pc and transfer it to your smartphone. For this scenario I recommend JTileDownloader.
If you want to bulk download tiles on your phone you can try PDA TileManager.

Features:
- Showing map in fullscreen.
- Finger friendly user interface.
- Map tiles are automatically downloaded if internet connection is available.
- Map tiles are stored locally for offline use.
- GPS support and GSM triangulation.
- Show actual position on map.
- Follow-mode to automatically scroll the map.
- Search addresses.
- Calculate routes.
- Choose between different map providers.
- Multi-language support.
- Self-update functionality.
- GPS and GSM tracking (not yet implemented).

If you like this project, please consider donate to the developer.

Update Description:
v1.5.4067.39959:
- Just a few bugfixes to prevent instabilities on certain phones.

v1.5.4053.7488:
New features:
- Button to force re-download of actually viewed tiles.
- Word wrapping for GraphicText.
- Show arrow with direction when moving instead of pin.
- Added HD2 multitouch feature (pinch-to-zoom).
- Bookmark functionality.
- Re-designed the context menu.
- Added reverse geocoding.
- Implement optional 2x map zoom.
- Re-worked settings screen to fit more items on smaller screens.
- Added copy&paste to textboxes.
- Added "clear search results" to context menu.
- Draw straight flight route from A to B.

Fixed issues:
- Corrected version check routines with proper translations.
- Prevent creating folders for tiles when downloads are disabled.
- Correct button alignments on some windows.
- Prevent backlight dimming while OMM is in foreground.
- Deleting downloaded cab on first start.

v1.4.3816.9028 (Hotfix 2):
- WebServices updated to match the new OpenMobileMaps website. Due to porting the official OMM homepage from Perl to ASP.NET, I had to update the feedback messaging system and updating functionality.

v1.4.3811.31921 (Hotfix):
- bug fixed in registration form: some email addresses were rejected as being invalid.

v1.4.3802.40868:
- Many many bugs fixed (like ommconfig.xml and maps.xml problems...).
- Download speed improved.
- Multi-language support (new languages can be downloaded from server).
- Software is able to use different map providers.
- Registration for users who have donated introduced. This will grant you full features of OpenMobileMaps. IMPORTANT: everyone who already has donated, please register (About->Register) your copy of OpenMobileMaps!
- Zoom level is displayed inside of drag button.
- New icon for windows mobile 6.5 phones.
- World-wide route calculation possible.

v1.3.3745.22382:
- Bug fixed: trying to download tiles beyond 2^zoom-1.
- Scale added.
- Zooming in and out with softkeys possible (if your phone has those).
- "Follow Me" and "Where Am I?" feature changed into a button with push-pin. The button appears, when you tap or move the map. This automatically turns off "Follow Me" mode. To turn it on just tap on the button with the red push-pin.
- Context menu and Main Menu reorganized (removed/replaced entries).
- Support for other map sources. GUI added to select different map sources. The maps are save in osmcache/maps.xml.
- Yellow Pins for search results added.
- Address Search changed to use OSM Nominatim first -> see http://nominatim.openstreetmap.org. ORS address search is only used as a fallback. Nominatim supports address search for the whole planet (not only europe)!
- Bug fixed: negative coordinates were interpreted wrong.
- Bug fixed: search pins are now behind other controls.
- Info reduced. GPS and GSM info is shown when tapped on the red push-pin.
- Gps device/service/fix state is visible in the bottom left corner. Red boxes mean: gps device is on but service is not yet ready. Orange boxes mean: gps device/service on but NO FIX. Number of green boxes shows the signal quality on FIX.
- Bug fixed: map tiles weren't updated when using cursor buttons.
- Size of initial download information reduced.
- Size of About window reduced.
- Maps.xml creation after install optimized (should not make problems anymore).
- The gray box to open the main menu got a "MENU" label to make it easier to find for novice users.

v1.2.3732.42197:
- New menu added (click on the grey box at the bottom of the map). Drag the menu down to hide it or press the enter key on your phone (if your phone has one) to toggle it.
- Removed some entries from context menu.
- Removed "Get Route": it's always calculated if Start and Finish are set.
- Self update function.
- Bug in parsing coordinates fixed.
- Some gui improvements.
- Improved map scrolling speed by hiding controls temporary.
- Size of zoombar and little grey box changed.
- Address Search Window re-design to match the new GUI.
- Feedback system built in. You can post your feedback on the OpenMobileMaps homepage or directly from your phone! (About -> Send Feedback...) Your feedback will be displayed on the homepage. If you send it through your phone I might be able to answer to your feedback directly.
- Bugs in GPS and GSM positioning fixed.
- Zooming bug after map scrolling fixed.
- Downloading can be turned on/off in Settings.
- Zoom-bar tapping optimized: tapping on +/- will increase/decrease 1 zoom-level.
- Double tapping on map will center the position instead of zooming in.
- Shipping map zoom levels 1-3 within cab for starters.
- Address search crashing fixed.
- Minimizing application now possible (through main menu).

v1.2.3722.269:
- Completely rewritten GSM positioning including circle calculation.
- Switch between mph and km/h.
- Status and Controls on/off moved back to context menu for faster access.
- Counting data sent/received over internet connection.
- Completely rewritten GUI handling.
- Performance optimizations for new GUI.
- About-window added with check for latest version.
- Zooming effect added.
- Location Utility Service XSD implemented (for address search).
- OpenStreetMap and Windows Mobile logo optimized for higher resolutions. BTW: the new gui adapts to all kinds of resolutions, no matter wheither it is running on QVGA or Full HD!
- Route calculation added. Hint: in address search select an address and go to context-menue. Choose wheither it is your route start or finish. When start and finish are selected then select "get route".
- Application icon updated.
- Bugs fixed.