Rhodan vs Sea Depth
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rhodan
Transform your iPhone into a remote control for your trolling motor. Monitor real-time performance data and adjust motor settings wirelessly for a seamless fishing experience.
- Wireless motor control
- Real-time performance data
- Custom motor configuration
- Over-the-air firmware updates
- Remote steering and mode changes
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Full Control. Real-Time Data. Seamless Updates. Rhodan turns your iPhone into a powerful command center for your trolling motor. Whether you're on the water or preparing for your next trip, this app provides direct wireless control and live performance monitoring — giving you complete control at your fingertips. Key Features: • Wireless Motor Control – Remotely start, stop, steer, and change operation mode of your trolling motor. • Live Runtime Data – View real-time stats including speed, direction, battery voltage, and more. • Custom Motor Configuration – Fine-tune your motor settings to match your fishing style and environment. • Over-the-air Firmware Updates – Stay current with the latest performance improvements and features by updating your motor wirelessly. Designed for ease of use and built for performance, Rhodan puts everything you need in one intuitive app — so you can focus on what matters most: fishing!
Sea Depth
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.
- 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
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SeaDepth delivers professional-grade bathymetric charts for anglers looking to add a new level of detail and insight offshore. Built using high-resolution survey data and advanced shaded-relief techniques, SeaDepth reveals underwater structure, contours, and terrain that traditional charts often fail to show. The result is a clearer, more intuitive view of the seafloor - helping anglers and captains better understand offshore environments before and during time on the water. In addition to detailed depth visualization, SeaDepth offers optional data overlays, intelligent contour labeling, waypoint interoperability, and analytical tools that enhance situational awareness offshore. Key Features • High-resolution shaded-relief bathymetry • Detailed, clearly labeled depth contours • Intelligent contour interval scaling by depth range • Pipeline overlay (Gulf of America) • Bottom composition overlays highlighting seafloor characteristics • GPX waypoint import and export for interoperability with other platforms • Drift Test tool to observe drift direction and speed over time • Offline chart access for use beyond cellular coverage • Smooth zooming and panning optimized for offshore use Depth Contours with Intelligent Labeling SeaDepth uses a graduated contour labeling scheme designed to provide maximum detail where it matters most, while maintaining clarity and performance in deeper depths: • 1-foot contour intervals from 1 to 500 feet • 10-foot contour intervals from 500 to 2,500 feet • 80-foot contour intervals from 2,500 feet to abyssal depths This approach delivers high-resolution insight in shallow and mid-depth areas while avoiding visual clutter in deepwater environments. Overlay Intelligence SeaDepth allows users to enable optional overlay layers such as pipelines and bottom composition data in supported regions, including the Gulf of America. These overlays provide additional context and help users interpret bottom features and structural edges with greater confidence. All available overlay layers are included at no additional charge. Waypoint Management (GPX Support) SeaDepth supports importing and exporting waypoints using the GPX file format, making it easy to move data between SeaDepth and other compatible marine devices, charting software, or planning tools. This allows users to maintain consistent waypoint libraries across platforms. SeaDrift-Drift Test Feature The built-in Drift Test feature helps users evaluate drift behavior by tracking movement over time. This is especially useful when assessing current and wind influence to have more productive drifts. Built for Offshore Reliability Charts, overlays, and waypoint data are stored locally on the device, allowing SeaDepth to function reliably offshore where connectivity may be limited or unavailable. Performance and usability are optimized for real-world offshore conditions. Disclaimer SeaDepth is intended as a supplemental planning and visualization tool only. It is not a substitute for official nautical charts, onboard navigation systems, or prudent seamanship. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: Rhodan at 5.0 against Sea Depth's 4.2. Rhodan also leads on in-app purchases (none vs 10). Sea Depth's advantage is ratings volume (16 vs 1). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Sea Depth sells 10 in-app purchases, starting at $99.99 per year. Rhodan asks for nothing beyond the download.
Rhodan holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Sea Depth has 16 ratings behind it against 1, so its average is the more settled of the two.
| Parameter | Rhodan | Sea Depth |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 4.2 (16 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 16 — better |
| Update frequency | — | Every 5 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 96 MB | 106 MB |
| Age rating | 17+ | 4+ |
| Developer | Rhodan Marine Systems of Florida, LLC | Seadepth Charts, LLC |
Customer experience
Rhodan
Sea Depth
In-app purchases
Rhodan
No in-app purchases
Sea Depth
- Premium Charts Access7 Days trial$99.991 Year
- Western GOA 50%$150.00
- Eastern GOA 30%$209.99
- Cental GOA 20%$239.99
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- Eastern GOA 20%$239.99
- Cental GOA$300.00
- Western GOA$300.00
- Eastern GOA$300.00
- Florida-West Coast$300.00
- South Florida/Northern Bahamas$300.00







