Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Chartplotter or anchor alarm app
- Anchor drop position
- Tide and current plan
Step-by-step instructions
Save the anchor position
Record the actual anchor location when it lands if your device allows; the bow GPS position after setting is not the anchor position.
Estimate the natural swing
Allow for rode length, GPS offset on the vessel, current and wind shifts that can move the bow in a normal arc.
Evaluate nearby hazards
Set the alert early enough to preserve maneuvering time before a shoreline, reef or neighboring vessel becomes a danger.
Use independent checks
Compare GPS alerts with visual transits, depth changes and the boat track, especially when GPS reception is degraded.
Test the alert
Confirm alarm volume, phone power, app background permissions and notifications before relying on it overnight.
Safety note
An anchor alarm can fail through power loss, GPS errors or software settings. Continue appropriate anchor watch, especially in bad weather.
Key takeaway
A useful alarm reflects where the anchor lies and how the boat is expected to swing.
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.