A damaged or corroded radar arch compromises not only your navigation electronics but the structural integrity of your vessel. Whether you are berthed in Porto Montenegro, cruising the Boka Bay, or anchored near Budva, YachtService.me provides professional boat radar arch repair across the Montenegrin coast — from assessment and welding to refinishing and electronics re-installation.
What This Guide Covers
Why Radar Arch Damage Should Never Be Ignored
The radar arch is a critical structural element on modern motor yachts and sailing boats. It supports radar arrays, GPS antennas, navigation lights, satellite communication domes, cameras, and sometimes even solar panels. When the arch is compromised — whether by corrosion, impact, or fatigue cracking — every piece of equipment mounted on it is at risk.
In the Adriatic Sea, boats face a combination of salt spray, intense UV exposure, and occasional storm conditions that accelerate wear on stainless steel and aluminium structures. Yachts based in Tivat, Kotor, and Herceg Novi are especially exposed to the humid microclimate of Boka Bay, which can speed up galvanic corrosion if dissimilar metals are present in the arch assembly.
Beyond safety, a deteriorating radar arch affects the resale value and survey results of any vessel. Surveyors flag structural issues on arches immediately, and neglected repairs can lead to costly emergency work during the charter or cruising season.
Common Causes of Radar Arch Damage in Montenegro
Corrosion and Electrolysis
Stainless steel arches can develop crevice corrosion at weld joints and mounting bases. Aluminium arches are vulnerable to electrolytic attack when fasteners or brackets of a different metal are used. The warm, saline waters around Lustica Bay and the southern Montenegrin coast intensify these processes.
Impact and Stress Cracking
Low bridge clearances, crane mishaps during haul-out, and vibration from high-speed cruising can cause hairline cracks at stress points. Even a small crack at the base weld will grow over time if left unrepaired.
UV and Weather Degradation
GRP (fibreglass) radar arches found on some production boats suffer from gelcoat crazing and delamination after prolonged Adriatic sun exposure. Paint or powder-coat finishes on metal arches can also blister, exposing raw material to the elements.
Important Note
Before any repair begins, all electronics mounted on the radar arch — radar, antennas, lights, and wiring — must be carefully removed and catalogued. This prevents damage to sensitive marine electronics and ensures correct re-installation after the structural work is complete.
Step-by-Step Radar Arch Repair Process
Step 1: Thorough Inspection and Assessment
A marine technician inspects the entire arch structure, looking for surface corrosion, weld cracks, pitting, paint bubbling, and loose mounting bolts. At YachtService.me, we use dye-penetrant testing on critical welds to detect hidden fatigue cracks invisible to the naked eye. The condition of mounting feet and deck reinforcement plates is also checked.
Step 2: Removal of Electronics and Hardware
All radar units, antennas, lights, cable runs, and solar panels are carefully disconnected and labelled. Cables are tagged and photographed so that rewiring after repair is accurate and efficient. This step also allows a full inspection of the underside of mounting plates.
Step 3: Structural Repair — Welding and Fabrication
Cracked welds are ground back and re-welded using TIG welding for stainless steel or aluminium, matching the original material grade. If a section of tubing is severely corroded or deformed, it is cut out and a new section is fabricated and welded in place. For GRP arches, damaged laminate is cut away, fresh fibreglass mat and resin are laid up, and the area is faired smooth.
Step 4: Surface Treatment and Finishing
Repaired stainless steel sections are passivated and polished to restore corrosion resistance. Aluminium repairs are primed and painted or anodised. GRP arches receive fresh gelcoat or marine-grade paint. All fastener holes are sealed and new isolation gaskets are fitted where dissimilar metals meet to prevent future electrolysis.
Step 5: Re-installation of Electronics
All radar units, antennas, navigation lights, and wiring are re-mounted and reconnected. Cable glands are sealed against water ingress. A function test of every piece of equipment is performed before the yacht leaves the yard.
Step 6: Final Inspection and Sea Trial
A final visual and hands-on check confirms structural integrity, finish quality, and electronics functionality. For yachts heading out through Boka Bay into the open Adriatic Sea, a short sea trial ensures that vibration at cruising speed does not affect the repaired arch.
Need Radar Arch Repair in Montenegro?
YachtService.me offers professional radar arch inspection, welding, fabrication, and refinishing for yachts and boats in Tivat, Porto Montenegro, Kotor, Budva, Herceg Novi, and Lustica Bay. Our team handles stainless steel, aluminium, and GRP structures with precision.
Radar Arch Repair Checklist
- Inspect all welds and joints for cracks, pitting, or corrosion
- Check mounting feet and deck reinforcement plates
- Remove and label all electronics, antennas, and wiring
- Perform dye-penetrant or visual crack detection
- TIG weld repairs using matched material grade
- Fabricate replacement tube sections if needed
- Passivate, polish, or repaint repaired surfaces
- Install isolation gaskets between dissimilar metals
- Re-mount and test all radar and navigation electronics
- Seal all cable glands and fastener penetrations
- Conduct a final structural and function check
Pro tip: Schedule radar arch inspection during your annual haul-out or winter lay-up in Montenegro. Catching small cracks early saves significant time and cost compared to emergency repairs during the summer season.
Book Professional Yacht Service in Montenegro
From radar arch repair to full yacht maintenance, YachtService.me supports yacht owners, captains, and crews with marine service, structural repair, and electronics installation across the Montenegrin coast and the Adriatic.
Frequently Asked Questions
What materials are radar arches typically made from?
Most radar arches on yachts are constructed from stainless steel (316 marine grade), aluminium, or GRP (fibreglass). Each material requires a different repair approach — TIG welding for metals and laminate layup for GRP.
How do I know if my radar arch needs repair?
Look for visible rust staining, hairline cracks around welds, wobble or flex when you push the arch by hand, paint blistering, or corroded mounting bolts. Any of these signs warrant a professional inspection.
Can a radar arch be repaired on the water or does the boat need to be hauled out?
Many radar arch repairs can be completed with the boat in the water at a marina berth in Porto Montenegro, Tivat, or Kotor. However, if the mounting feet or deck reinforcement need work, a haul-out may be advisable.
How long does a typical radar arch repair take?
Minor weld repairs and refinishing can often be completed in one to three days. More extensive fabrication — such as replacing an entire tube section — may take up to a week depending on material sourcing and weather conditions.
Will my electronics be safe during the repair?
Yes. At YachtService.me, all radar units, antennas, and wiring are carefully removed, labelled, and stored before any structural work begins. They are re-installed and function-tested after the repair is complete.
Can you modify or upgrade my radar arch at the same time?
Absolutely. Many owners take the opportunity to add extra antenna mounts, LED light bars, solar panel brackets, or camera poles during a repair. Contact YachtService.me to discuss custom modifications.
How can I prevent radar arch corrosion in the future?
Use isolation gaskets between dissimilar metals, apply quality marine-grade coatings, rinse the arch with fresh water regularly, and schedule annual inspections — especially if your yacht is based year-round in the humid Boka Bay climate.