Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Depth sounder
- Tide information
- Rode length marks
Step-by-step instructions
Work out real depth
Combine chart or sounder depth with tidal change and height from waterline to bow roller.
Choose a conservative scope
Consider anchor and rode manufacturer guidance, holding ground, wind, swell and swing room.
Calculate required rode
Multiply total vertical distance by your chosen scope ratio; common all-chain starting points vary with conditions.
Allow for swing circle
Check nearby boats, shallow areas and hazards at all likely wind and current directions.
Set and verify
Back down gradually after laying out the rode and confirm position over time using visual bearings and an anchor alarm.
Safety note
No fixed scope guarantees holding. Poor seabed, reversing current, waves or extreme wind may require a different anchorage or technique.
Key takeaway
Calculate from the bow to the seabed at high tide, not just the depth on the sounder.
Keep this job on your maintenance schedule
Save the topic as a maintenance task, choose a due date or engine-hour target, and record future service. Free and stored on your device.
Add to my maintenance plannerThis guide is for general education. Follow your equipment manufacturer’s instructions, current navigation guidance and applicable marine safety standards. When uncertain, use a qualified marine professional.