Comparison

RT vs Sea Depth

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

RT

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
Read full description

Hilton's Realtime-Navigator Mobile Navigation Application. Navigate on almost real-time imageries such as sea surface temperatures, chlorophyll, surface currents, altimetry, and salinity using your iPad, iPhone, and/or iPod device(s) as your chartplotter! Features include: -Ability to create waypoints/routes "On the fly" -Waypoint creation and editing -Map zooming -Point to point navigation -Real-time GPS location -Ability to change chart selection "On the fly" The RT-Nav app interfaces with the RT-Nav.com website to provide a platform to allow subscribers the ability to navigate on desired RT-Nav.com images using youriPad, iPhone, and/or iPod device(s) as a chartplotter. View your real-time position on dynamic maps outside of cell/internet range navigating to temp breaks (probable weedlines), color changes, or default/custom waypoints by using our touch-screen technology!

About

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.

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
Read full description

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

RT4 screens
Sea Depth4 screens

Verdict

The call

The clearest difference is review sentiment: Sea Depth at 100% against RT's 0%. Sea Depth also leads on rating (4.4 vs 3.0) and update cadence (every 5 days vs monthly). RT's advantage is chart position (#175 vs unranked). On price, ratings volume, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

Sea Depth holds the better App Store score, 4.4 against 3.0. Both are backed by a comparable volume of ratings — 8 and 14 respectively. Written reviews point the same way: 0% of RT's written reviews are positive against 100% of Sea Depth's.

UpkeepUpdate frequency

RT ships an update monthly, Sea Depth every 5 days. The most recent releases landed on October 9, 2026 and October 18, 2026 respectively.

Scorecard5 real differences · 6 level
RT versus Sea Depth: the parameters behind the verdict, then further details
ParameterRTSea Depth
PriceFreeFree
Rating3.0 (8 ratings)4.4 (14 ratings) — better
Positive reviews0.0% of reviews100.0% of reviews — better
Number of ratings814 — better
Update frequencyMonthlyEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#175 — better—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.015.0 — better
Further details — not scored
Size13 MB106 MB
Age rating4+4+
DeveloperHilton's Fishing Charts, L.L.C.Seadepth Charts, LLC

Customer experience

RT

All ratings8 ratings
Positive37.5%
Neutral25.0%
Negative37.5%
Written reviews4 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Sea Depth

All ratings14 ratings
Positive85.7%
Neutral0.0%
Negative14.3%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

5 purchases

RT

One-time5
  • 1 Day Subscription$29.99
  • 1 Week Subscription$49.99
  • 1 Month Subscription$99.99
Show 2 more
  • 1 Year Subscription$199.99
  • One Year International$199.99
10 purchases

Sea Depth

Subscriptions1
  • Premium Charts Access7 Days trial$99.991 Year
One-time9
  • Western GOA 50%$150.00
  • Eastern GOA 30%$209.99
  • Cental GOA 20%$239.99
Show 6 more
  • 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

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?
Sea Depth is rated higher. RT averages 3.0 out of 5 from 8 ratings, while Sea Depth averages 4.4 from 14 ratings.
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 every 5 days. Most recently, RT was updated on October 9, 2026 and Sea Depth on October 18, 2026.

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