Ideal for seafarers, the Casio G-Shock Gulfman ($65) provides moon and tide data in a tough water-, shock- and rust-resistant configuration. This digital watch features a moon and tide graph display that reveals the tide height by the hour and moon phase by day. Additional features of the G-Shock Gulfman includes 29 time zones, a countdown timer, a stopwatch, three multi-function alarms and an auto electroluminescent backlight with Afterglow.