8.14 IlluminationAdjusting the backlight level — i50 TridataThe backlighting level can be accessed using theDepth button.During normal operation:1. Press and hold the Depth button forapproximately 2 seconds to display the Backlightpage.LAMPS is displayed on-screen and the currentbacklight level.2. Use the Reset button to increase the backlightsetting to the required level.3. Use the Trip button to increase the backlightsetting to the required level.The backlight level can be adjusted from level 1 to 9or switched Off (default).Note: The backlight page will time-out after 8seconds of inactivity.Adjusting the contrast — i50 TridataThe contrast level can be accessed using the Depthbutton.During normal operation:1. Press and hold the Depth button forapproximately 4 seconds to display the Contrastpage.CONtrASt is displayed on-screen and the currentcontrast level.2. Use the Depth button to cycle through theavailable contrast levels.The contrast level can be adjusted from level0 (default) to 3.Note: The contrast page will time-out after 8seconds of inactivity.Group illuminationGroup illumination is used to synchronizes andcontrol the backlighting level of multiple unitsassigned to the same group.The unit can participate in shared illuminationvia a SeaTalk network or group illumination via aSeaTalkng network.When connected on a SeaTalk network allcompatible units will share their backlight level (when1 unit's backlighting level is adjusted all other unitsbacklight level will also change).When connected on a SeaTalkng network the unitcan participate in group illumination and be assignedto a group of units which will share their backlightinglevels. Available groups are as follows:• OFF (default) — Group illumination isswitched off• HL1 — Helm 1• HL2 — Helm 2• CPt — Cockpit• FLY — Flybridge• NST — Mast• GP1 to GP5 — User defined groupsWhen assigned to a group, when the backlighting of1 unit is adjusted the backlighting level of all unitsassigned to the same group will also change.Assigning the i50 Tridata to a groupTo assign the i50 Tridata as part of a group so that itcan participate in group illumination follow the stepsbelow.During normal operation:1. Press and hold the Depth and Speed buttonsat the same time for 6 seconds, until the Groupillumination page is displayed.GROUP CAL is displayed on-screen.Note: The Group illumination entry page is atemporary page and will time-out to the previouspage after 8 seconds.2. Press the Depth button to display the Groupspage.3. Press the Trip and Reset buttons at the sametime to enable selection of a group.The group setting will flash.4. Use the Reset button to cycle upwards throughthe list of available groups.5. Use the Trip button to cycle back down throughthe list.6. Press the Trip and Reset buttons at the sametime to assign the display to the selected group.The group setting will stop flashing.7. Press and hold the Depth and Speed buttonsat the same time for approximately 2 seconds toreturn to normal operation.68 i50