Make sure you have a dedicated source off the battery or off the block to each unit. If you power them off an accessory wire it is too much draw and this will happen. With my 3 units they would reboot when I would crank the boat until I ran dedicated wires.
Also do not trust the voltage on the graph for the battery voltage (this differs from supply voltage). There is a huge thread on BBC about this. Depending where your power wire is at, it could be drawing voltage off the NMEA backbone, the accessory switch or a number of other things giving you a false supply reading on the HDS readout.
Edited by Chris Coufal (07/25/16 06:34 PM)