For those that might be interested, the latest version of Overland Navigator has been released. It was supposed to be a minor release, but there are a fair number of features that were added in a large part because they were of interest to OAUSA (and the SAR community).
Thanks to everyone here who participated in the Beta Testing. Larry in particular provided some really great feedback.
Some of the new features include:
[*]APRS specific NMEA support
[*]Location specific Sunrise / Sunset times
[*]UTM Coordinate Display
[*]Continuous GPS Track Storage to Disk
[*]GPS Output to external devices
[*]NMEA logging
[*]Display preferences
[*]High end GPS support - Track up to 64 satellites
[*]Bugfixes and performance enhancements
There is a more complete description on the webpage, but a brief explanation of the APRS display support... the software supports the APRS specific NMEA sentences that the Kenwood D7xx radios, Tiny Tracker 4, Argent Data Systems, etc trackers output. This allows Overland Navigator to display APRS specific symbols on the map. The radio/tnc/tracker is still responsible for handling the beaconing of your location.

You connect your GPS to Overland Navigator for input, then connect Overland Navigator to your tracker as it's GPS input. The tracker uses this connection to send any stations it heard back to Overland Navigator. This is, for example, the same way that you'd hook up a Garmin GPS to a tracker. There are some advantages to using Overland Navigator over a regular GPS though.

In contrast to most GPS units, when new stations are heard, Overland Navigator will update the location on the map instead of adding an additional waypoint. This greatly reduces the amount of on-screen clutter and removes the need to manually delete waypoints.
The APRS waypoints automatically fade away and then expire on their own. This lets you visually see how long it's been since you last heard from an APRS station. You can set the interval. If you have it set to 40 minutes, and a symbol is just about ready to disappear then you know it's been about 40 minutes since you last heard from it.

Finally, we tried to redo all the APRS symbols to have a consistent look/feel , offer more contrast with the background maps, and to be distinguishable from regular Overland Navigator waypoints (square).
Primary Symbols
Secondary Symbols
Having implemented an initial version via NMEA, I'd like to do a more complete version in the future. Messaging, sharing APRS objects other than your own location, etc would all be very cool. It won't be in the next version, but as a developer, I have the bug now.

I believe Larry has this setup on his laptop with the Kenwood D710a if anyone wants to take a look. Let me know if you have any questions and I'll do my best to answer.
Craig