Astro sight reduction calculator

Can anybody suggest a palmtop or programmable calculator with suitable software for astro sight reductions on board? This to cut out and cross check against some of the blunders I make when tired.

Try www.celestaire.com they have a good selection.

Try the Psion 5 MX and Navigate by Wizworld. It's shareware and a total nav program, Tides E.P's SunSights. Jon