Wireless Speed Computer Instruction Manual
1. Introduction The SPEEDWATCH wireless speed computer is a highly accurate means to measure speed through water of any low‐speed watercraft such as a sailboat, yacht, kayak or small powered boats. Designed for the serious racer and the advanced users, the SPEEDWATCH gives valuable feedback on the performance of your watercraft. The small impeller is placed under the craft, in a variety of mounting possibilities.
Description of Instruments DISPLAY a) b) c) d) e) f) g) LCD Backlight button Speed select button Distance select button Chronometer start button Spring snap for mounting plate Battery cover (four screws) TRANSMITTER h) i) j) k) 0.
2.
3. Starting up the Instrument Display From the factory, the SPEEDWATCH is in a low power state, with the time “12:00” flashing. Press any button to enter normal mode. The SPEEDWATCH is now in Manual Mode; it will only receive data from the transmitter when the CHRONO button is pressed and the impeller is rotating. The default speed is KNOTS, which can be changed to mph, km/h, or m/s.
Transmitter The SPEEDWATCH Transmitter requires a 9V battery to operate; this is included in your system. To install the battery, gently pull the cap exposing the battery compartment. Install the 9V battery and replace the battery cap. Be sure to press the cap back on fully to form the water tight seal. Failure to do this could result in the 9V battery failing. The electronics in the SPEEDWATCH transmitter are completely factory sealed.
4. Programming the SPEEDWATCH Enter the programming mode to set the: Chronometer – manual or automatic Countdown timer Speed unit Time Balanced speed duration Calibration of sensor To enter the programming mode, you must be in either MANUAL chronometer mode with the timer stopped, or in automatic and not reading any signal (the timer will be stopped). Press and hold both the SPEED and CHRONO buttons for three seconds to enter the programming mode.
SPEED UNIT Press the CHRONO or DISTANCE buttons to select the speed unit. This can be set to km/h (kilometres per hour), m/s (meters per second), knots, or mph (miles per hour). Press the SPEED button to confirm setting and advance. TIME SETTING Press the CHRONO button to advance the time, and the DISTANCE button to move the time back. Press and hold the button to change the time faster.
5. Basic Operating Mode General Use of Buttons LIGHT Button: Turns on the backlight for five seconds (while in any mode) SPEED Button: Selects the speed displayed in large digits: instant, balanced, maximum, or trip average DISTANCE Button: Selects the distance displayed: trip or total CHRONO Button: Starts and stops the chronometer and speed reading. Also starts and pauses the countdown timer.
Countdown Timer The SPEEDWATCH can be set to provide a countdown timer for the start of races. To enter the programming mode, you must be in either MANUAL chronometer mode withthe timer stopped, or in automatic and not reading any signal (the timer will be stopped). Press and hold both the SPEED and CHRONO buttons for three seconds to enter the programming mode. Press the SPEED button to advance to the timer setting. Press the CHRONO or DISTANCE buttons to select the countdown timer.
6. Mounting the SEEDWATCH The SPEEDWATCH is the ultimate in flexibility in mounting. The impeller is mounted under the boat, with several options. The transmitter is mounted on the inside of the hull, with the pickup receiver within 30 centimeter of the impeller. The display can then be placed anywhere in the boat within 5 meter of the transmitter. A plastic mounting bracket is attached to the display and can be mounted to a flat surface, or the Velcro strap used to wrap around a mast or leg.
Orientation of impeller, transmitter and display To have maximum distance between the impeller and the transmitter we recommend that the transmitter is perpendicular position with the impeller as shown in the picture below. The position between the transmitter and the display is also maximum if the display is perpendicular to the transmitter. Three mounting systems are included in the SPEEDWATCH kit; a removable fin mount, a large fin to be fixed on the keel back side and a rudder mount.
Impeller mounting options Rudder attachment: Small white fin mount: Large blade fin mount: Thoroughly clean the surface before mounting with adhesive, and wait 24 hours before submersion for best adhesion.
7. Calibration of the Speed Sensor This operation allows the SPEEDWATCH to be fine‐ tuned for exceptional accuracies. This is normally not needed. However the SPEEDWATCH can be calibrated to match an existing speed sensor to accurately measure speed. Calibration is carried out from the programming mode. Press and hold both the SPEED and CHRONO buttons for three seconds to enter the programming mode. “chrono” and “man” (manual) or “auto” (automatic) will flash.
8. Technical Specifications IMPELLER TRANSMISSION The impellers, mounted on synthetic sapphire bearings, are equipped with powerful magnets that generate magnetic impulses. These impulses are collected by coils (also called "Sensor") and treated electronically to be displayed speeds on a LCD, as speeds. The magnetic impulses can go through any materials: fiberglass, carbon fiber, aramid fiber, wood, plastic, aluminium, stainless steel, etc... This is why you do not need to pierce your hull.
9. Limited Warranty JDC ELECTRONIC SA extends a 12 months’ warranty over parts and labour for this instrument, effective from the date of purchase. JDC ELECTRONIC SA reserves the right to repair or replace any component which may have become faulty in the course of normal use. This repair or replacement shall be carried out at no charge to the customer (parts or labour). Transport costs however shall be borne by the customer.
