TSD rallying for fun...what equipment?

[RDMcG]

I do the occasional club rally with the OH, and was thinking that some sort of clipboard/stopwatch/calculator would be handy. ( We are definitely not talking Sebastian Loeb, more Thomas the tank engine). If there are people who rally for a mild bit of competition, is there a handy all-in-one item I could use?........or just use a calculator and stopwatch?...... would be grateful for any advice.