Fish Mapping vs Sea Depth
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fish Mapping
This app provides detailed fishing recommendations and environmental data to help anglers find the best spots for bait and game fish. It displays information like plankton strength, sea surface temperature, and ocean currents to optimize fishing trips.
- Fishing Recommendations
- Weed Lines
- Plankton Front Strength
- Sea Surface Temperature
- Sub-Surface Temperatures
- Sea Surface Height Anomalies
- Ocean Currents
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Let SiriusXM Marine Fish Mapping help save time and fuel by showing you the spots where conditions are best for bait fish to gather and where game fish are most likely to hunt. The Fish Mapping App is included with your SiriusXM Marine Fish Mapping subscription. With the Fish Mapping App, anglers can view the following features on their phone or tablet: • Fishing Recommendations • Weed Lines • Plankton Front Strength & Contours • Sea Surface Temperature Front Strength & Contours • 30m Sub-Surface Temperatures • Sea Surface Height Anomalies • Ocean Currents • Historical Data Note: SiriusXM Marine weather features are not available on the Fish Mapping App. Download the Fish Mapping App now and start using it on your smartphone or tablet to help plan your next fishing trip! App requires internet access. Not a Fish Mapping subscriber? Learn more at siriusxm.com/fishmapping. -------------------------- The Fish Mapping App is only available with your Fish Mapping subscription and subscriptions require a compatible satellite-enabled device. The Fish Mapping App is not sold separately. Access to the app may take up to 24 hours from subscription activation to process and access is limited to 2 devices. Internet access is required for the Fish Mapping App. Data rates may apply. Subscription and service fees, content, and features are subject to change. IMPORTANT INFORMATION: Not all devices are capable of receiving all services offered by SiriusXM. Current information and features may not be available in all locations, or on all receivers. Data displays vary by device; images are representative only. SiriusXM services may include weather and other content and emergency alert information. Such information and data is not for “safety for life,” but is merely supplemental and advisory in nature, and therefore cannot be relied upon as safety critical in connection with any aircraft, seacraft, automobile, or any other usage. SiriusXM is not responsible for any errors or inaccuracies in the data services or their use. See Fish Mapping coverage area at siriusxm.com/marine/coverage-map. SiriusXM Privacy Policy: www.siriusxm.com/privacy Your Privacy Choices: www.siriusxm.com/yourprivacychoices SiriusXM Customer Agreement: www.siriusxm.com/customeragreement
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 review sentiment: Sea Depth at 100% against Fish Mapping's 50%. Sea Depth also leads on update cadence (weekly vs every 3 weeks) and chart position (#192 vs unranked). Fish Mapping's advantage is rating (3.7 vs 3.0) and in-app purchases (none vs 10). On price, ratings volume, ads and device support 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. Fish Mapping asks for nothing beyond the download.
Fish Mapping holds the better App Store score, 3.7 against 3.0. Both are backed by a comparable volume of ratings — 3 and 4 respectively. Written reviews complicate that: 50% of Fish Mapping's written reviews are positive against 100% of Sea Depth's, so the app with the better star average is not the one people write more warmly about.
Fish Mapping ships an update every 3 weeks, Sea Depth weekly. The most recent releases landed on September 9, 2026 and September 14, 2026 respectively.
| Parameter | Fish Mapping | Sea Depth |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (3 ratings) — better | 3.0 (4 ratings) |
| Positive reviews | 50.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 3 | 4 — better |
| Update frequency | Every 3 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Subscription | Free with in-app purchases — better |
| Best chart rank | — | #192 — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.4 — better | 15.0 |
| Further details — not scored | ||
| Size | 57 MB | 105 MB |
| Age rating | 4+ | 4+ |
| Developer | OceanBytes Holding LLC | Seadepth Charst |
Customer experience
Fish Mapping
Sea Depth
In-app purchases
Fish Mapping
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





