OLC and Cambridge 10/20/25 support ending

I was an early (and remain a) strong supporter of the OLC - gave the
first OLC presentation to the Seattle Glider Council (SGC) - for
stimulating growth in cross-country soaring. Check-out the increase
in SGC participation over the life of the OLC!

As a Cambridge 20 user, I lament the end of OLC support. However, I
do not want to replace my Cambridge 20 - L-NAV - PDA with Glide
Navigator II installation.

Getting ready to make my wish list for Santa and would appreciate
recommendations for a back-up system that will likely remain
compatible with the OLC system.

Thanks in advance.