Hi Take it he is using only 1 base station BEFORE any birds arrive from the 2 races you must put each pocket clock into the base station and let them pick up the details (race, no of birds ect) When finished with race 1 before removing the pocket clock delete trainers, insert 2nd pocket clock and let it download the birds that are home from race 2 Been using 2 pocket clocks with 1 base station never had any problems Cheers Homer 49