Trojan Boat Forum

i recently bought a new to me 12 meter Trojan 1989 aft cabin and have been trying to learn all the electronics. I've got manuals or been able to google them all except for a datamarine dart unit. The one on the bridge reads mostly 8's and one in the salon appears to be off. There are buttons for depth, alarm, speed, log, time, temp and alarm plus up/down arrows for those functions. didn't see an on/off button. Does anyone have a manual or knows how the buttons function? It could also be that they are toast. The units look like this, i don't know the model nos.

These are the guys that used to work at Data Marine and still repair the equipment. Maybe they can help you out http://www.dmimarine.com/