# RT vs Sea Depth

RT and Sea Depth both sit at 3.0 stars, but that hides the real split: 100% of Sea Depth's written reviews are positive against 0% of RT's. Sea Depth also leads on update cadence (weekly vs monthly) and iOS requirement (15.0 vs 26.0). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. RT sells 5 one-off in-app purchases and Sea Depth sells 10 in-app purchases, starting at $99.99 per year. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 3.0 for RT against 3.0 for Sea Depth. Both are backed by a comparable volume of ratings — 8 and 4 respectively. Written reviews are what separate them: 0% of RT's written reviews are positive against 100% of Sea Depth's.

RT ships an update monthly, Sea Depth weekly. The most recent releases landed on September 23, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | RT | Sea Depth |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (8 ratings)](https://appshunter.io/ios/app/rt-nav/id586307815/reviews) | [3.0 (4 ratings)](https://appshunter.io/ios/app/sea-depth/id6747972372/reviews) |
| Number of ratings | **8** | 4 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | #200 | **#187** |
| Size | 13 MB | 105 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hilton's Fishing Charts, L.L.C.](https://appshunter.io/developer/586307818) | [Seadepth Charst](https://appshunter.io/developer/1823642107) |

## What reviewers say

### RT

[App page](https://appshunter.io/ios/app/rt-nav/id586307815)

**Currently charting:** #200 Top Grossing · Navigation (US App Store)

Navigate using real-time oceanographic data like sea surface temperatures and currents on your mobile device. Create and edit waypoints, zoom maps, and track your GPS location for point-to-point navigation. Access dynamic maps even without cell service.

**Highlights:** Real-time oceanographic imagery, Waypoint creation and editing, Map zooming, Point-to-point navigation, Real-time GPS tracking, Offline navigation capabilities

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Day Subscription | $29.99 | one-time |
| 1 Week Subscription | $49.99 | one-time |
| 1 Month Subscription | $99.99 | one-time |
| 1 Year Subscription | $199.99 | one-time |
| One Year International | $199.99 | one-time |


### Sea Depth

[App page](https://appshunter.io/ios/app/sea-depth/id6747972372)

**Currently charting:** #187 Top Grossing · Navigation (US App Store)

Visualize detailed underwater terrain with high-resolution bathymetric charts. Gain deeper insights into seafloor structure, contours, and terrain for offshore activities. Includes optional data overlays and waypoint management for enhanced situational awareness.

**Highlights:** High-resolution shaded-relief bathymetry, Detailed depth contours with intelligent labeling, Optional data overlays (pipelines, bottom composition), GPX waypoint import/export, Drift Test tool, Offline chart access

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Charts Access | $99.99 | per year |
| Western GOA 50% | $150.00 | one-time |
| Eastern GOA 30% | $209.99 | one-time |
| Cental GOA 20% | $239.99 | one-time |
| Eastern GOA 20% | $239.99 | one-time |
| Cental GOA | $300.00 | one-time |
| Western GOA | $300.00 | one-time |
| Eastern GOA | $300.00 | one-time |
| Florida-West Coast | $300.00 | one-time |
| South Florida/Northern Bahamas | $300.00 | one-time |


## Frequently asked questions

### Is RT free?

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

### Is Sea Depth free?

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

### Which has better reviews, RT or Sea Depth?

RT and Sea Depth are both rated 3.0 out of 5 on the App Store, from 8 and 4 ratings respectively.

### Do RT or Sea Depth have ads?

Neither RT nor Sea Depth shows ads.

### Which is updated more often, RT or Sea Depth?

RT ships an update monthly, and Sea Depth weekly. Most recently, RT was updated on September 23, 2026 and Sea Depth on September 14, 2026.

### Which is more popular, RT or Sea Depth?

RT currently peaks at #200 in the App Store charts, and Sea Depth at #187. Chart position reflects recent download velocity rather than total install base.

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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.*