There is a Zumo Forum and you can join and ask the question there. I just looked and found the "Post" linked below:
https://www.zumouserforums.co.uk/viewtopic.php?t=3318Link to Zumo Forum main screen.
https://www.zumouserforums.co.uk/index.phpAnd I do use Basecamp for my Zumo 595. Not thrilled but, I can make it work and I do take my laptop on the road with me. I can modify the route on the road but not as easy as it use to be using Microsoft Trips and Sheets, (which I still use for a few things when I need a quick look at a proposed route).