According the APRSdroid web site
http://aprsdroid.org/, the app is open source and donate if you want to. But it's $4.29 in the Market. If you don't want to pay, download the source and build it yourself. But really, $4.29 is almost free.
I saw apps in the Market that will sent NMEA data over Bluetooth. If you can connect a Bluetooth to the TM-D700, maybe that will work? One of the is called Bluetooth GPS
https://market.android.com/details?id=googoo.android.btgps&feature=search_resultNo Droid phone here yet, I'm eligible for an upgrade discount next week. Drooling over the Droid 3 right now :-)