Comparison

C vs Sea Maps

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

Head to head
About

C

Access up-to-date nautical charts for global exploration and planning. Save points of interest and routes, record tracks, and view marine weather. Upgrade for offline maps, GPS, and advanced features like shaded relief and AIS.

Highlights
  • Free chart viewer
  • Autorouting
  • Personal waypoints
  • Track recording
  • Marine weather forecasts
  • Offline map downloads
  • High-resolution bathymetry
Features
Read full description

The C-MAP® App is the perfect companion for recreational boaters and water-lovers. Available on Mobile, Tablet or PC, you’ll always be able to access the most up to date C-MAP charts, wherever in the world you are. With full features, allowing you to explore, plan and save Points of Interest and Routes from wherever you are, the C-MAP App is the perfect aid to navigation for savvy boaters. The C-MAP App Includes: - FREE Chart Viewer - Autorouting™ – find the best route to your favourite places - Personal Waypoints - Track Recording - Thousands of pre-loaded Points of Interest - Marine Weather Forecast - Weather Along the Route - Weather Overlay - Chart Personalisation - Import & Export GPX Files – share your Routes, Tracks or Waypoints with friends - Measure Distance Tool Upgrade to Premium to unlock additional features, including: - Full GPS Functionality - Offline Map Downloads - REVEAL Shaded Relief - High-Resolution Bathymetry - Custom Depth Shading - AIS & C-MAP Traffic Try before you buy… Experience C-MAP App Premium for yourself, with a free 14-day trial (3-day trial in Denmark and Sweden). The C-MAP App updates on a continual basis, ensuring the latest, most up-to-date maps are always at your fingertips. Payment will be charged to iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. Links to Your Privacy Policy and Terms of Use. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable Privacy Policy: https://www.brunswick.com/dsar Terms of Service https://appchart.c-map.com/tos.html

About

Sea Maps

This marine navigation app provides boaters with interactive maps, real-time weather overlays, and AIS vessel tracking. It offers advanced features like bathymetry, anchor alarms, and track recording for safe and informed ocean exploration.

Highlights
  • Interactive marine charts
  • Real-time weather overlays
  • AIS vessel tracking
  • Anchor alarm system
  • Track recording
  • Bathymetry data
Features
Read full description

Sea Maps is a marine navigation and weather app designed for boaters, anglers, and ocean explorers. Enjoy a free trial, then continue with a paid subscription to access all core features, including weather overlays, AIS vessel tracking, and advanced marine charts. Sea Maps Features -Core Navigation & Mapping Interactive map with multiple map types (Water World, Satellite, Streets, Hybrid, Moonlight, Ocean Contours) GPS location services with real-time user position tracking Automatic region management and centering. -Navigation & Compass Full-screen compass display with magnetic heading indicator Speed Over Ground (SOG) in real-time (knots) Bearing to pin: Green arrow showing direction to dropped pin Minimized heading view at top of screen Track recording: Start/stop with map snapshots Background location tracking -Marker & Pin System Dropped pin information popup with precise coordinates Latitude/Longitude display in DMS format (Degrees, Minutes, Seconds) Distance calculation from current location to pin Ocean current data at pin location (speed & direction) Sea surface temperature at pin location Pin management & removal Save custom markers with names and descriptions -Marine Weather & Ocean Data Sea Surface Temperature (SST) - Heat map with customizable temperature range (15-28°C) Ocean Winds - Wind speed heat map with animated wind particles and direction indicators Ocean Currents - Current flow visualization with particle animation Visible Satellite Imagery - Real-time satellite overlay Wind Animation Timeline - Play/pause/scrub controls for wind data Marine Forecast System - 7-day weather forecast with tide, swell, wind, and ocean current charts Weather Icons - Colour-coded weather conditions with moon phases -AIS (Automatic Identification System) Real-time AIS vessel tracking and information Detailed ship information popup with position, speed, heading Ship type classification and categorisation -Bathymetry & Charts Bathymetry Overlay - Ocean depth contours with configurable visualisation Navigation Aid Markers - Buoys, lights, and other maritime markers Chart Data Caching - Local storage for offline access -Safety & Monitoring Anchor Alarm System - Geofencing with configurable radius (50m default) Real-time Distance Monitoring - Continuous tracking from anchor point Background Location Tracking - Continuous monitoring even when app is closed Customizable Alarm Radius - Adjustable geofence size Track Management - GPS route recording with timestamps and custom naming Track Visualization - Display recorded routes on map Map Snapshots - Capture track data with map images -Settings & Customization Map Type Selection - Grid-based interface for choosing map styles Unit Conversions - Temperature (Celsius/Fahrenheit) and speed (Metric/Imperial) Accessibility Support - Dynamic text sizing -Subscription Details Sea Maps requires an active subscription to access app features. Pricing and duration are displayed in the app before purchase. A free trial is available for new users. Manage or cancel anytime through your App Store account settings. -Terms and Policies Privacy Policy https://www.appaspires.com/privacy/privacy.pdf Terms of Use https://www.appaspires.com/terms/termsofuse.pdf

Screenshots

C4 screens
Sea Maps4 screens

Verdict

The call

The clearest difference is review sentiment: Sea Maps at 100% against C's 51%. Sea Maps also leads on rating (5.0 vs 4.5). C's advantage is monetization model (free with in-app purchases vs subscription) and ratings volume (2.3K vs 1). On price, update cadence, 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. C sells 10 in-app purchases, starting at $1.99 per month and Sea Maps sells 3 in-app purchases, starting at $14.99 per 3 months. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Sea Maps holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: C has 2.3K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 51% of C's written reviews are positive against 100% of Sea Maps's.

UpkeepUpdate frequency

C ships an update every 6 weeks, Sea Maps monthly. The most recent releases landed on October 15, 2026 and October 7, 2026 respectively.

Scorecard6 real differences · 5 level
C versus Sea Maps: the parameters behind the verdict, then further details
ParameterCSea Maps
PriceFreeFree
Rating4.5 (2.3K ratings)5.0 (1 ratings) — better
Positive reviews51.0% of reviews100.0% of reviews — better
Number of ratings2.3K — better1
Update frequencyEvery 6 weeksMonthly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases — betterSubscription
Best chart rank#96 — better—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.1 — better26.0
Further details — not scored
Size169 MB106 MB
Age rating4+4+
DeveloperNavico Norway ASAPP ASPIRES

Customer experience

C

All ratings2,347 ratings
Positive89.3%
Neutral3.1%
Negative7.6%
Written reviews512 reviews
Positive51.0%
Neutral8.6%
Negative40.4%

Sea Maps

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

C

Reported bugs

4 issues
  • App crashes when trying to save tracks or routes
  • Offline maps fail to download or disappear
  • Depth/contour data inaccurate or not displaying properly
  • Login and authentication issues preventing access

Requested features

4 requests
  • Add mast height/clearance feature
  • Improve AIS integration and functionality
  • Allow more customization of map views and data
  • Provide better customer support and communication

Sea Maps

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

C

Subscriptions10
  • Embark Advanced Weather$1.991 Month
  • Embark Offline Maps USA$2.491 Month
  • Annual Subscription14 Days trial$14.991 Year
Show 7 more
  • Annual subscription14 Days trial$14.991 Year
  • Region14 Days trial2 variants$18.991 Year
  • North America14 Days trial$23.491 Year
  • Maps Lakes South East USA14 Days trial$25.991 Year
  • Annual Subscription14 Days trial$29.991 Year
  • Caribbean14 Days trial$32.991 Year
  • Maps USA East Coast & Bahamas14 Days trial$39.991 Year
3 purchases

Sea Maps

Subscriptions3
  • 3 Months Subscription14 Days trial$14.993 Months
  • 6 Month Subscription14 Days trial$24.996 Months
  • 1 Year Subscription14 Days trial$39.991 Year

Questions

Is C free?
C is free to download, with in-app purchases available.
Is Sea Maps free?
Sea Maps is free to download, with in-app purchases available.
Which has better reviews, C or Sea Maps?
Sea Maps is rated higher. C averages 4.5 out of 5 from 2.3K ratings, while Sea Maps averages 5.0 from 1 ratings.
Do C or Sea Maps have ads?
Neither C nor Sea Maps shows ads.
Which is updated more often, C or Sea Maps?
C ships an update every 6 weeks, and Sea Maps monthly. Most recently, C was updated on October 15, 2026 and Sea Maps on October 7, 2026.

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