I'm not familiar with the vodia connection, but I wouldn't think it would be that hard to find a hot terminal somewhere and run a small wire with a fuse to power the tracker. Your bilge pump power supply should be hot when the boat is unattended. How 'bout that wire?
Thanks for the input. Looks like it will be simpler to avoid the engine connection and simply attach the power lead directly to the battery via a fused switch or alternatively use the bilge pump switch on the power consule?