A system for monitoring progress of at least two parties who have agreed to meet at a predetermined destination substantially at the same time. The system tracks location of each party and estimates remaining time or distance or both of each party to the destination. Querying of each party as to location may be adjusted as to frequency of polling for example based on changing progress towards the destination. Location or remaining time or distance to the destination may be communicated to each of the parties. The system may establish a new predetermined destination based on updated progress of the parties.