I'd like to have a sticky one stop shop thread for all the upgrades people have found/recommend for the Solo.
Props:
GPS:
Solo GPS Shield V2 - 3DR
mRo GPS u-Blox Neo-M8N (Release 2)
Range extenders:
DSLRPros Horizon Range Extender Kit (3DR SOLO)
ITELITE - 3DR Solo Range Booster ITE-DBS03.3...