Folks,
All the Trimble aviation GPS now comes under the FreeFlight Inc. banner.
FreeFlight Systems - GPS Retrofits and Upgrads
The cost of the upgrade to the bigger memory card is quite moderate,for all the 2101s, under US$500, for what is an almost all new unit. As I understand it, it's a new motherboard, plus other hardware and firmware, as well as the 4gb card.
All the manuals can be downloaded from their site.
Tootle pip!!