Allows you to enter the Tidal Harmonic Constants for any European port (available in NP160 for European Waters or part 3 of NP201 Admiralty Tide Table). After the harmonic constants have been entered the predictions are displayed as a graph of height against time for a period of up to 24 hours and 7 consecutive days. The results can be printed. The software can store any number of ports or tidal stream stations. The product is everlasting. : Best with a 200Mhz processor or better, with a minimum 64Mb RAM, and CD-ROM drive.