Power source for GPS & FF

[Gitzit 2]

Jim, speaking of power issues with electronics.....

i sometimes have an issue with my HDS units going blank when i start the motor after a drift, etc...not all the time...may once every ten starts but it is a PITA when it happens.
my starting battery is new, this season, but may be borderline for the motor CCA's.

what is your opinion about connecting my GPS & FF to my trolling motor battery?

i don't use it all that often and it never gets the big instantaneous drain like starting the motor.

thanks.