# Great Depths vs SeaDrive

The clearest difference is rating: SeaDrive at 4.5 against Great Depths's 4.2. SeaDrive also leads on review sentiment (89% vs 70%) and ratings volume (263 vs 12). Great Depths's advantage is iOS requirement (8.0 vs 18.1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Great Depths sells 19 one-off in-app purchases and SeaDrive sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

SeaDrive holds the better App Store score, 4.5 against 4.2. That said, the two scores are not equally well evidenced: SeaDrive has 263 ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 70% of Great Depths's written reviews are positive against 89% of SeaDrive's.

Great Depths ships an update every 6 weeks, SeaDrive fortnightly. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Great Depths | SeaDrive |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (12 ratings)](https://appshunter.io/ios/app/great-depths/id647627464/reviews) | **[4.5 (263 ratings)](https://appshunter.io/ios/app/seadrive-boat-navigation/id1497056662/reviews)** |
| Number of ratings | 12 | **263** |
| Positive reviews | 70.0% of reviews | **89.5% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 19 MB | 58 MB |
| Requires iOS | **8.0** | 18.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Walk About Apps](https://appshunter.io/developer/480229755) | [SeaDrive LLC](https://appshunter.io/developer/1497054442) |

## 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 (19)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lake Michigan | Free | one-time |
| Huge East Coast Charts | Free | one-time |
| Mississippi and West Florida Coast | Free | one-time |
| Midwest Florida Coast | Free | one-time |
| Southwest Florida Coast | Free | one-time |
| Southeast Florida Coast | Free | one-time |
| Northern NC, Virginia and Delaware 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 |
| Florida Keys and the Dry Tortugas | Free | one-time |
| Lake Superior | Free | one-time |
| Northern SC and Southern NC | Free | one-time |
| The Border Lakes | Free | one-time |
| Lake Champlain | Free | one-time |
| Lake Erie | Free | one-time |
| Lake Champlain | $0.99 | one-time |


### SeaDrive

[App page](https://appshunter.io/ios/app/seadrive-boat-navigation/id1497056662)

This marine navigation app offers offline charting, route planning, and tide/current predictions. It provides free US charts and integrates weather forecasts and points of interest like marinas. Share your live track with others for enhanced safety and communication on the water.

**Highlights:** Offline charting and navigation, Route building and navigation, Tide and current predictions, 5-day weather forecasts, Live track sharing, Points of Interest (marinas, boat ramps)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sea Drive Pro | $2.99 | per month |
| Sea Drive Pro | $34.99 | per year |
| US Charts | Free | one-time |

**What reviewers like**

- 👍 Intuitive and easy to use interface
- 🗺️ Accurate navigation and depth finder
- 🌟 Great for planning routes and marking spots
- 🤝 Easy to share trips with friends
- 💨 Excellent weather and tide features

**What reviewers complain about**

- 🐛 Waypoints deleted multiple times
- 🐛 Vessel location disappeared
- 🐛 App crashes when downloading charts

**Reported bugs**

- Waypoints are deleted by the app
- Vessel location disappears
- App crashes during chart download on older devices

**Requested features**

- Consider adding more advanced charting options
- Further refine waypoint saving reliability


## Frequently asked questions

### Is Great Depths free?

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

### Is SeaDrive free?

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

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

SeaDrive is rated higher. Great Depths averages 4.2 out of 5 from 12 ratings, while SeaDrive averages 4.5 from 263 ratings.

### Do Great Depths or SeaDrive have ads?

Neither Great Depths nor SeaDrive shows ads.

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

Great Depths ships an update every 6 weeks, and SeaDrive fortnightly. Most recently, Great Depths was updated on October 23, 2026 and SeaDrive on October 24, 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.*