Comparison

C vs TZ iBoat

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

TZ iBoat

Navigate the seas with advanced marine charts, GPS, and AIS data, even offline. This app offers detailed bathymetry, community-contributed map data, and dynamic features for safe boating, sailing, and fishing.

Highlights
  • Offline marine charts
  • GPS and route planning
  • AIS Online tracking
  • Community map contributions
  • Dynamic mooring and lighting
  • Advanced fishing tools
  • Tides and tidal currents
Features
Read full description

Your next-generation chartplotter. Navigate with the world’s #1 marine charts app for coastal boating, sailing, and fishing. Marine GPS, nautical charts, AIS Online, tides & tidal currents, anchoring, marine weather, radar, sounder, and NMEA data — everything you need for safer navigation at sea. Built for sailors, boaters, and fishermen who need reliable navigation anywhere, online or offline. THE SMARTEST AND CLEAREST NAVIGATION INTERFACE AT SEA A cutting-edge interface makes navigation clearer and faster: • TZ Bar: quick access to key features • Dedicated screens: Weather, Fishing, NavData, Logbook, Mooring, Tides, Sounder • Cleaner chart view, easier to read • Customizable interface for faster access • Modern design focused on readability WHAT YOU CAN DO WITH TZ iBoat • Navigate with marine GPS and nautical charts • Monitor AIS targets locally and globally • Plan routes and anchor safely • Access tides, currents, and weather forecasts • Fish smarter using oceanographic data FOR SAILORS & BOATERS – Navigate safely • TZ MAPS: vector, raster, satellite, and bathymetry charts • SMART SEARCH: find marinas, buoys, tide stations, routes • DYNAMIC LIGHTS: real-time light sectors • DYNAMIC MOORINGS: wind-aware anchorage • Precise GPS for coastal navigation AIS & SAFETY – Stay aware beyond your horizon • AIS ONLINE: global AIS targets via internet (Essential plan) • Share AIS data with the community • Radar and onboard instrument integration • Real-time traffic awareness for safer navigation FOR FISHERMEN – Gain the edge Turn ocean data into real fishing results: • Identify productive zones using SST, chlorophyll, currents, altimetry (Elite plan) • Spot fish-holding conditions faster • BATHYVISION: high-resolution bathymetry with contour lines • Target high-potential areas with precision • EVENT & CATCH: log and analyze catches on nautical charts WEATHER – Clearer and more useful • Dedicated Weather screen • Real-time forecasts and offline access • Rain Radar with lightning data • High-resolution models available in Premium plan • Iridium GO! compatibility CONNECTIVITY & PRECISION • NMEA connectivity: manage and prioritize data sources • Connect AIS, radar, autopilot, and instruments • Latitude/longitude keyboard optimized for use at sea • Easy coordinate entry with multiple formats COMMUNITY & ECOSYSTEM • COMMUNITY MAPS: share local knowledge (hazards, POIs, marinas) • Contribute and improve charts • Trusted by 500,000+ boaters worldwide SUBSCRIPTION PLANS Choose the plan that fits your needs: • Essential: AIS Online, onboard instruments, autopilot integration via Wi-Fi NMEA • Premium: Essential + high-resolution forecasts, Rain Radar, multiple models, comparison • Elite: Premium + ocean layers (SST, Chlorophyll, SSH, Currents). Monthly and annual plans available, with savings on yearly options. Core features remain available for free. CHARTS AND DATA PLANS SUBSCRIPTIONS: The payment will be debited from the Apple account once the purchase is confirmed. The subscriptions and automatic renewals can be managed by entering the account settings after making the purchase. Any unused part of a free trial period, if offered, will be lost when a subscription is purchased. Terms of use: https://mytimezero.com/eula/ Privacy policy: https://mytimezero.com/privacy-statement/

Screenshots

C4 screens
TZ iBoat4 screens

Verdict

The call

C and TZ iBoat both sit at 4.5 stars, but that hides the real split: 80% of TZ iBoat's written reviews are positive against 51% of C's. TZ iBoat also leads on update cadence (every 8 days vs every 6 weeks). On price, rating, ratings volume and ads 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 TZ iBoat sells 13 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.5 for C against 4.6 for TZ iBoat. Both are backed by a comparable volume of ratings — 2.4K and 885 respectively. Written reviews are what separate them: 51% of C's written reviews are positive against 80% of TZ iBoat's.

UpkeepUpdate frequency

C ships an update every 6 weeks, TZ iBoat every 8 days. Both last shipped on October 29, 2026.

Scorecard2 real differences · 9 level
C versus TZ iBoat: the parameters behind the verdict, then further details
ParameterCTZ iBoat
PriceFreeFree
Rating4.5 (2.4K ratings)4.6 (885 ratings) — better
Positive reviews51.0% of reviews79.6% of reviews — better
Number of ratings2.4K — better885
Update frequencyEvery 6 weeksEvery 8 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#90#85 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.114.2 — better
Further details — not scored
Size169 MB428 MB
Age rating4+4+
DeveloperNavico Norway ASNobeltec, Inc.

Customer experience

C

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

TZ iBoat

All ratings885 ratings
Positive91.5%
Neutral3.2%
Negative5.3%
Written reviews393 reviews
Positive79.6%
Neutral7.1%
Negative13.2%

User reviews

C

From 2.4K App Store ratings

What we love

  • 🚀 Accurate maps and charts
  • 👍 Easy to use and intuitive
  • 📍 Helpful for planning trips and routes
  • 🛳️ Useful for both professionals and beginners
  • ⚙️ Detailed features like shaded relief and weather info

Room to improve

  • 🐛 Frequent crashes and freezes
  • ⚠️ Unreliable GPS tracking and location updates
  • 🔌 Offline maps and features not working as expected
  • 🤔 Confusing or missing functionality (e.g. route editing)
  • 💸 Expensive subscription, not worth the cost

TZ iBoat

From 885 App Store ratings

What we love

  • 🚀 Easy to use
  • 🚀 Accurate charts
  • 🚀 Useful features (weather, tides, currents, etc.)
  • 🚀 Good integration with Furuno radar and AIS
  • 🚀 Seamless cloud sync between devices

Room to improve

  • 🐛 Occasional crashes or freezing
  • 🐛 Inaccurate or outdated charts in some areas
  • 🐛 Anchor alarm not loud enough
  • 🐛 Difficulty importing/managing routes and waypoints
  • 🔋 Battery drain on mobile devices

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

TZ iBoat

Reported bugs

3 issues
  • GPS position not updating reliably while moving
  • Radar overlay not functioning properly
  • Compatibility issues with older devices or iOS versions

Requested features

5 requests
  • Automatic routing and trip planning
  • Improved satellite imagery and overlays
  • Better integration with other marine electronics
  • More customization options for data displays
  • Ability to mirror camera feeds as a rear-view

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
13 purchases

TZ iBoat

Subscriptions11
  • Essential Subscription$2.991 Month
  • Premium Subscription$9.991 Month
  • Great Lakes7 Days trial$19.991 Year
Show 8 more
  • Canada East and North7 Days trial$19.991 Year
  • Canada West7 Days trial$19.991 Year
  • USA7 Days trial$19.991 Year
  • Bahamas7 Days trial$30.991 Year
  • Central America & Caribbean7 Days trial$30.991 Year
  • Elite Subscription$39.991 Month
  • Western Mediterranean7 Days trial$40.991 Year
  • Eastern Mediterranean7 Days trial$61.991 Year
One-time2
  • AIS module$8.99
  • Radar module$49.99

Questions

Is C free?
C is free to download, with in-app purchases available.
Is TZ iBoat free?
TZ iBoat is free to download, with in-app purchases available.
Which has better reviews, C or TZ iBoat?
TZ iBoat is rated higher. C averages 4.5 out of 5 from 2.4K ratings, while TZ iBoat averages 4.6 from 885 ratings.
Do C or TZ iBoat have ads?
Neither C nor TZ iBoat shows ads.
Which is updated more often, C or TZ iBoat?
C ships an update every 6 weeks, and TZ iBoat every 8 days. Most recently, C was updated on October 29, 2026 and TZ iBoat on October 29, 2026.
Which is more popular, C or TZ iBoat?
C currently peaks at #90 in the App Store charts, and TZ iBoat at #85. Chart position reflects recent download velocity rather than total install base.

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