Citizen takes its light-powered, GPS-connected wristwatch technology underwater this week as the Japanese watchmaker debuts two Promaster dive watches set for the first time with the Citizen Cal. F158 Eco-Drive Satellite Wave GPS movement.
The new watches are being billed by Citizen as the first light-powered dive watch with GPS satellite capabilities. The newest Promasters are also fully compliant the International Organization for Standardization (ISO) standard for dive watches and feature water resistance to 200 meters.
To use the new models beneath the waves, a diver first presses the push buttons at 2 o’clock and 4 o’clock simultaneously, which sends the watch into Dive mode. All functions, except time display, will then stop in order to prevent erroneous user operations. It will not enter into Dive mode if the charged battery amount is insufficient.
Both watches are cased with Citizen’s proprietary Super Titanium, which Citizen then enhances with a surface-treatment hardening technology called Duratect MRK. While both models measure 47mm in diameter, the blue dialed option (model CC5006-06L) is finished in a glossy black hue using a DLC layering technique, which enhances scratch resistance.
Sea of features
These are professional-level dive watches, echoing much of the Promaster collection, which features a range of high-spec dive, aviation and racing watches. Citizen has ensured that each model boasts a unidirectional bezel with knurled notches, a screw lock crown, sapphire crystal, charge capacity display function and light-level indicator.
And, as is required for ISO compliance, the Eco-Drive Satellite Wave GPS Diver 200m dials are easy to read with large, luminous indexes and hands.
Citizen’s proprietary light-powered Eco-Drive Cal.F158 will operate for about seven years on a full charge – even without a light source. This insures that the various high-tech functions will operate uninterrupted.
Thus, the watches will continue to receive location and time information anywhere in the world using GPS satellite signals. This data will automatically correct the time and world calendar. Even without GPS satellite function, the watch is rated to an accuracy of ± five seconds per month. The wearer can also manually adjust the crown to change city and calendar, if desired.
For experienced or aspiring divers, Citizen has emblazoned the dial ring on both watches with the abbreviated names of eight famous diving locations, including Sharm El Sheikh, Maldives, Phuket, Great Barrier Reef, Fiji, Hawaii, Galapagos and Fernando de Noronha.
Citizen supplies each watch with a urethane band and an extension band for wet suit use.
Prices: $1,395 (Super Titanium case with black DLC coating and blue dial) and $1,350 (Super Titanium case and green dial).