I run my Zumo switched. During shut off of the keyed igniton, there is a garmin delay timer on the zumo which asks the user to turn off the unit, or go to battery. I always go to battery after shut down. I think its like 30 seconds before shut down.
I may reconsider, but for this season I am content. As I have allot more to learn in its usage such as the filing system and access to downloaded maps.
Typically I am worried about battery drainage as I use the GPS for outback trips where I have few human contacts.
"Pain is weakness leaving the body"
"Nothings possible until its done!"
"If ya can't afford the fine, take the lead!"