Davetowz
Petty Officer 1st Class
- Joined
- Sep 19, 2012
- Messages
- 234
I use open CPN as my nav software. It has a drift alarm for anchoring. You set a limit in feet from a position and if you drift out of that range it sounds an annoying alarm to tell you as much. This is my preferred way of knowing if my anchorage has allowed drift. It can be set to take into consideration tide swings .. just depends on where you set the alarm range.