# C vs VMGPolar

C and VMGPolar both sit at 4.5 stars, but that hides the real split: 100% of VMGPolar's written reviews are positive against 51% of C's. VMGPolar also leads on in-app purchases (none vs 11) and update cadence (fortnightly vs every 6 weeks). C's advantage is ratings volume (2.3K vs 3) and chart position (#119 vs unranked). On price, rating, ads and device support there is nothing between them.

Both are free to download. C sells 10 in-app purchases, starting at $1.99 per month. VMGPolar asks for nothing beyond the download.

VMGPolar holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: C has 2.3K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 51% of C's written reviews are positive against 100% of VMGPolar's.

C ships an update every 6 weeks, VMGPolar fortnightly. The most recent releases landed on October 17, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | C | VMGPolar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (2.3K ratings)](https://appshunter.io/ios/app/c-map-boating/id967289980/reviews) | **[4.7 (3 ratings)](https://appshunter.io/ios/app/vmgpolar/id6451073241/reviews)** |
| Number of ratings | **2.3K** | 3 |
| Positive reviews | 51.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#119** | — |
| Size | 169 MB | 1 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Navico Norway AS](https://appshunter.io/developer/842162153) | [Andrei Skobtsov](https://appshunter.io/developer/1696471952) |

## What reviewers say

### C

[App page](https://appshunter.io/ios/app/c-map-boating/id967289980)

**Currently charting:** #119 Top Grossing · Navigation (US App Store)

Access up-to-date nautical charts for global exploration and planning. Save points of interest and routes, record tracks, and view marine weather. Upgrade for offline maps, GPS, and advanced features like shaded relief and AIS.

**Highlights:** Free chart viewer, Autorouting, Personal waypoints, Track recording, Marine weather forecasts, Offline map downloads, High-resolution bathymetry

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Embark Advanced Weather | $1.99 | per month |
| Embark Offline Maps USA | $2.49 | per month |
| Annual Subscription | $14.99 | per year |
| Annual subscription | $14.99 | per year |
| Region | $18.99 | per year |
| North America | $23.49 | per year |
| Maps Lakes South East USA | $25.99 | per year |
| Annual Subscription | $29.99 | per year |
| Caribbean | $32.99 | per year |
| Maps USA East Coast & Bahamas | $39.99 | per year |

**What reviewers like**

- 🚀 Accurate maps and charts
- 👍 Easy to use and intuitive
- 📍 Helpful for planning trips and routes
- 🛳️ Useful for both professionals and beginners
- ⚙️ Detailed features like shaded relief and weather info

**What reviewers complain about**

- 🐛 Frequent crashes and freezes
- ⚠️ Unreliable GPS tracking and location updates
- 🔌 Offline maps and features not working as expected
- 🤔 Confusing or missing functionality (e.g. route editing)
- 💸 Expensive subscription, not worth the cost

**Reported bugs**

- App crashes when trying to save tracks or routes
- Offline maps fail to download or disappear
- Depth/contour data inaccurate or not displaying properly
- Login and authentication issues preventing access

**Requested features**

- Add mast height/clearance feature
- Improve AIS integration and functionality
- Allow more customization of map views and data
- Provide better customer support and communication


### VMGPolar

[App page](https://appshunter.io/ios/app/vmgpolar/id6451073241)

Calculate sailing wind and boat speed with this tool. Input three values to determine the rest and log your data for export. It helps build and validate polar graphs for sailing performance.

**Highlights:** Sailing wind and boat speed calculation, Input three values to calculate others, Save data into a log, Export log data, Build and validate polar graphs

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is C free?

C is free to download, with in-app purchases available.

### Is VMGPolar free?

VMGPolar is free to download, with no in-app purchases.

### Which has better reviews, C or VMGPolar?

VMGPolar is rated higher. C averages 4.5 out of 5 from 2.3K ratings, while VMGPolar averages 4.7 from 3 ratings.

### Do C or VMGPolar have ads?

Neither C nor VMGPolar shows ads.

### Which is updated more often, C or VMGPolar?

C ships an update every 6 weeks, and VMGPolar fortnightly. Most recently, C was updated on October 17, 2026 and VMGPolar on October 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*