HIKERS wanting to know how far and how fast they have walked have until now relied on pedometers. You measure your average stride and enter it into the pedometer, which then measures the number of strides and does a simple multiplication. Cyclists have a far more accurate option with trip computers, but they can be difficult to wire up. Now there is a product that requires no wires and provides a highly accurate measurements for walkers, runners, hikers, cyclists, rollerbladers and even windsurfers. No matter how you are moving, the Timex IronMan Speed + Distance watch will measure the distance covered and your current, average and maximum speeds using a small GPS satellite receiver. The Timex Ironman Speed + Distance will be available from next month. There are three models, priced from $2,300 to $2,700. Call 2815-0191 for more details.