Comparison

C vs Anchor Alert

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

Anchor Alert

Monitor your boat's position and anchor status from anywhere. Set custom alerts for real-time and forecast conditions, and access detailed marine weather forecasts. Connects to your boat's N2K network or works independently.

Highlights
  • Anchor and boat position monitoring
  • Customizable real-time and forecast alerts
  • N2K DataHub integration
  • PredictWind marine weather forecasts
  • Local anchorage knowledge and reviews
  • Works on and off the boat
Features
Read full description

Get the best and newest Anchor App developed by the trusted world leaders in marine forecasting - PredictWind Monitor your boat from anywhere on your phone. Set alerts & monitor your boat at anchor, view live N2K data and weather forecasts, on or off the boat. Customise your alerts, then relax knowing your boat is in good hands, with Anchor Alert. * Monitor your Anchor and Boat Position - Set your anchor position and preferences in quick or advanced mode, then monitor your vessel and position history on the map. Can be used with just your Phone or connected to your N2K backbone and a PredictWind DataHub. * 3 Modes, Simple, Advanced or Datahub linked - Use Simple Mode to quickly drag the anchor into position and set a safe radius. Advanced allows you to manually enter data for increased accuracy. DataHub Link reads your N2K data and fills in the relevant info, then input how much chain you’ve let out, and you’re done! * Set Up Alerts - Use our preset alerts or customise your own real-time and forecast alerts. The DataHub allows Anchor Alert to read your boat’s N2K network and alert you when conditions move outside your specified safe limits. * Works On & Off The Boat - Monitor your vessel and receive alerts onboard via the DataHub’s Wi-Fi network, or head ashore and stay connected over your vessel's existing internet connection. The DataHub is compatible with the Iridium GO! exec and other satellite connections to keep you connected literally anywhere on earth. * Get PredictWind Weather forecasts - Know exactly what weather is headed your way, with highly accurate marine forecasts by PredictWind. View world-leading weather data with Daily Briefing, Tables and Graphs. * Find the best spots to Anchor with Local Knowledge - See anchorage ratings and reviews from other users to get the top tips and advice. Leave your Boat in Good hands with Anchor Alert by PredictWind. Terms & Conditions: The Anchor Alert App is not error or bug free. You agree to use the Anchor Alert App carefully and at your own risk. We disclaim all representations and warranties of any kind, expressed or implied, including, without limitation, the warranties of merchantability and fitness for a particular purpose. We are not liable for damages, direct or consequential, resulting from your use of the Anchor Alert App. You agree to defend, indemnify and hold us harmless from any claims, losses, liability costs and expenses (including, but not limited to, legal fees) arising from any such use. You acknowledge that you have only a limited, non-exclusive, non-transferable license to use the Anchor Alert App. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.predictwind.com/about-us/privacy-policy/

Screenshots

C4 screens
Anchor Alert4 screens

Verdict

The call

The clearest difference is ratings volume: C at 2.3K against Anchor Alert's 12. C also leads on chart position (#98 vs unranked). Anchor Alert's advantage is update cadence (fortnightly vs every 6 weeks) and rating (4.7 vs 4.5). On price, ads, in-app purchases and monetization model 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 Anchor Alert sells 3 in-app purchases, starting at $15.00 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Anchor Alert holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: C has 2.3K ratings behind it against 12, 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 64% of Anchor Alert's.

UpkeepUpdate frequency

C ships an update every 6 weeks, Anchor Alert fortnightly. Both last shipped on October 15, 2026.

Scorecard5 real differences · 6 level
C versus Anchor Alert: the parameters behind the verdict, then further details
ParameterCAnchor Alert
PriceFreeFree
Rating4.5 (2.3K ratings)4.7 (12 ratings) — better
Positive reviews51.0% of reviews64.3% of reviews — better
Number of ratings2.3K — better12
Update frequencyEvery 6 weeksFortnightly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#98 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.0 — better
Further details — not scored
Size169 MB174 MB
Age rating4+4+
DeveloperNavico Norway ASPredictWind Limited

Customer experience

C

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

Anchor Alert

All ratings12 ratings
Positive91.7%
Neutral0.0%
Negative8.3%
Written reviews70 reviews
Positive64.3%
Neutral2.9%
Negative32.9%

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

Anchor Alert

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

Anchor Alert

Subscriptions3
  • Anchor Pro 1 monthly1 Month trial$15.001 Month
  • Anchor Pro 3 monthly1 Month trial$29.003 Months
  • Anchor Pro Yearly1 Month trial$99.001 Year

Questions

Is C free?
C is free to download, with in-app purchases available.
Is Anchor Alert free?
Anchor Alert is free to download, with in-app purchases available.
Which has better reviews, C or Anchor Alert?
Anchor Alert is rated higher. C averages 4.5 out of 5 from 2.3K ratings, while Anchor Alert averages 4.7 from 12 ratings.
Do C or Anchor Alert have ads?
Neither C nor Anchor Alert shows ads.
Which is updated more often, C or Anchor Alert?
C ships an update every 6 weeks, and Anchor Alert fortnightly. Most recently, C was updated on October 15, 2026 and Anchor Alert on October 15, 2026.

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