SJI Sailor
Well-known member
- Joined
- Nov 28, 2018
- Messages
- 804
- Non-Fluid Motion Model
- American Tug (formerly had C30)
I wanted to run my sonar logic by folks for a second opinion, before the tide goes out this evening.
We are docked with sonar reading 11.8 ft. Tide will go out another 8 or 9 feet. Assume 9 ft. That gives 2.8 ft clearance at low tide from the sonar location.
Figure that sonar is about 2ft below water line (2019 C30 sedan, installed next to the head). There is 0 offset on the Garmin setup. So that will net 4.8 feet from water line at low tide. Then take -3 ft draft (in reality probably a little bit less), for a net clearance of 1.8 feet from the bottom. So we're fine.
Sound right? (Another data point: we're on the winter dock at Sucia Fossil Bay, east side of the dock, and the neighbor says he's never seen anyone with a problem even in larger boats.)
Thanks in advance for a second opinion!
We are docked with sonar reading 11.8 ft. Tide will go out another 8 or 9 feet. Assume 9 ft. That gives 2.8 ft clearance at low tide from the sonar location.
Figure that sonar is about 2ft below water line (2019 C30 sedan, installed next to the head). There is 0 offset on the Garmin setup. So that will net 4.8 feet from water line at low tide. Then take -3 ft draft (in reality probably a little bit less), for a net clearance of 1.8 feet from the bottom. So we're fine.
Sound right? (Another data point: we're on the winter dock at Sucia Fossil Bay, east side of the dock, and the neighbor says he's never seen anyone with a problem even in larger boats.)
Thanks in advance for a second opinion!