# Great Depths vs C

The clearest difference is rating: C at 4.5 against Great Depths's 4.2. C also leads on ratings volume (2.4K vs 12) and chart position (#115 vs unranked). Great Depths's advantage is review sentiment (70% vs 51%) and iOS requirement (8.0 vs 15.1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Great Depths sells 10 one-off in-app purchases and C sells 9 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

C holds the better App Store score, 4.5 against 4.2. That said, the two scores are not equally well evidenced: C has 2.4K ratings behind it against 12, so its average is the more settled of the two. Written reviews complicate that: 70% of Great Depths's written reviews are positive against 51% of C's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 6 weeks. Both last shipped on November 1, 2026.

## The numbers

| Metric | Great Depths | C |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (12 ratings)](https://appshunter.io/ios/app/great-depths/id647627464/reviews) | **[4.5 (2.4K ratings)](https://appshunter.io/ios/app/c-map-boating/id967289980/reviews)** |
| Number of ratings | 12 | **2.4K** |
| Positive reviews | **70.0% of reviews** | 51.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | — | **#115** |
| Size | 19 MB | 169 MB |
| Requires iOS | **8.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Walk About Apps](https://appshunter.io/developer/480229755) | [Navico Norway AS](https://appshunter.io/developer/842162153) |

## What reviewers say

### Great Depths

[App page](https://appshunter.io/ios/app/great-depths/id647627464)

This app transforms your iOS device into a digital depth finder. It provides comprehensive US coastal and Great Lakes coverage with live tide data and nautical charts. Navigate safely and efficiently with offline chart storage and distance calculation features.

**Highlights:** Digital depth readouts, Live tide data, NOAA RNC nautical charts, Offline chart storage, Distance calculation, Automatic chart syncing

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Huge East Coast Charts | Free | one-time |
| Midwest Florida Coast | Free | one-time |
| Southwest Florida Coast | Free | one-time |
| Southeast Florida Coast | Free | one-time |
| The Chesapeake Bay | Free | one-time |
| New Jersey Coast and The Delaware River | Free | one-time |
| Connecticut and New York Coast | Free | one-time |
| Maine, New Hampshire and Northern Mass. | Free | one-time |
| All the Charts | Free | one-time |
| Lake Champlain | $0.99 | one-time |


### C

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

**Currently charting:** #115 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 (9)**

| 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 |
| 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


## Frequently asked questions

### Is Great Depths free?

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

### Is C free?

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

### Which has better reviews, Great Depths or C?

C is rated higher. Great Depths averages 4.2 out of 5 from 12 ratings, while C averages 4.5 from 2.4K ratings.

### Do Great Depths or C have ads?

Neither Great Depths nor C shows ads.

### Which is updated more often, Great Depths or C?

Great Depths ships an update every 6 weeks, and C every 6 weeks. Most recently, Great Depths was updated on November 1, 2026 and C on November 1, 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.*