Mainnav has just announce the ir latest GPS special for cyclist. Its the MG-600, a GPS data logger with an embedded light sensor include track of speed, distance, time, odometer, GPS coordinates and elevation. Mainnav MG-600 could logged data from Goggle Earth or Google Maps and equips by a rechargeable lithium-ion (850mAh) battery with up to 18-hours lifetime battery. The price is not yet confirm.