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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,952 companies indexed · Last updated: today
DirectoryCrafts & TradesGarageRomanshornGP MARINE GMBH
GP MARINE GMBH Logo
Verified· 4 sourcesTrust Score
Summary

About the company

GP MARINE GMBH operates a boatyard and an automobile garage. Its services include boat repairs, maintenance, engine overhauls, tuning, winter storage and custom work, as well as repairs, servicing and tyre services for cars and classic cars.

AI-generated
Presence

Service area

Offering

Products & services

Industry:Garage
✓ Offered7
Boat Repairs and Service
All boat repairs, service and drive work, maintenance and underwater treatment for boats.
Boat Engines and Engine Overhauls
BSO I / BSO II engines, engine overhauls, engine conversion to BSO II, as well as tuning and custom work related to engines.
Winter Storage for Boats
Winter storage for boats, including winter storage berths and indoor storage spaces for stowing during the cold season.
Car Repairs and Service
Repairs, service and tyre service for cars; support also for classic cars.
Trailers
Trailers in connection with the car workshop and the boat market.
Boat Rental
Rental of Sunset Island, IDEA 58 and IDEA 70.2 for events and day trips on the lake.
Boats and Marine Equipment
Stock boats, pre-owned boats, mooring spaces, accessories and engines in the boat market.
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4.1/5

GP MARINE GMBH

Trust & reputation

ranQ Trust Score of GP MARINE GMBH: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 100% · As of November 2026

GP MARINE GMBH scores 68.7 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.58.224%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.78.610%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.88.08%
GP MARINE GMBH scores 83.0 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.55.07%
GP MARINE GMBH scores 88.3 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).88.322%
GP MARINE GMBH scores 20.7 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.31.44%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.10.04%
Qualifications+0.00

GP MARINE GMBH reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 4.1 out of 5 stars from 21 customer reviews. As of November 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.1
of 5

Aggregated from 21 reviews across all connected sources

Sources
GGoogle4.121
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Press

Media

September 19, 2023Media
Gantner übernimmt GP Marine
leaderdigital.ch

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Comparisons

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Location

Romiszelgstrasse 7
8590 Romanshorn
Opening hours
Mon
07:30 - 12:00, 13:30 - 17:00
Tue
07:30 - 12:00, 13:30 - 17:00
Wed
07:30 - 12:00, 13:30 - 17:00
Thu
07:30 - 12:00, 13:30 - 17:00
Fri
07:30 - 12:00, 13:30 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-111.682.094
Founded
2004 · 22 years
Last commercial register change
May 23, 2024
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • TGRomanshorn
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
88.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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