“This app is a bait and switch!! They tell you it's a one time purchase but after 1 year you are cut off from updates and constantly nagged to re-purchase for another year. Anything you try and do in the app constantly presents nag screens…”
Independent automated assessment · 3 signal sources · 414 reviews scanned · analyzed 2026-10-04.
i-Boating:Marine Navigation
Gps Nautical Charts#1 Marine Charts App offers offline nautical charts, inland river navigation…
4.2 ★13,039 ratings
1M+Downloads
4+Age rating
—App size
Free · In-app purchasesIn-app purchases
About this app
#1 Marine Charts App offers offline nautical charts, inland river navigation charts, and lake contour maps w/ fishing AI, relief shading& lake depths. Only marine navigation app to have boat route assistance with Voice Prompts.Like having a Marine Chart plotter in one app! Nautical Charts w/course up orientation. Incl Tide Charts & Currents prediction for nautical navigation. Create Boat routes / Waypoints, or import existing GPX/KML routes on device. Has Marine AIS(NMEA) support.…
Preview
Real screenshots from the store listing.
Independent evidence report
Evidence and review signals
This is where the page changes from an app-store listing into an evidence report: findings, important reviews, pricing and a dated history.
Which version this describes
When we ran this analysis, and what the store lists now.
This analysis describes version 296.0 of the app, analyzed 2026-10-04 . The app may have changed since.
The store currently lists version 296.0, updated 2026-09-11.
What we measured
Each line is a measurement published as a measurement, never a verdict.
Each line is a measurement, published as a measurement. Where we have not looked, the line says so rather than reading as a zero.
Developer replies to reviews
Replies to at least 1 review in 20
Price in the store description
States no price and billing period
Cancelling, in the store description
Does not say how to cancel
Themes reported by reviewers
1 theme reported
Counted from the reviews we have read for this app. "No theme reported" means no theme reached our reporting threshold — it is not a finding that nothing is wrong with this app, and we do not say it is.
Five-star share of ratings
Under 65% five-star
Arithmetic on the stores' own published rating counts. It says nothing about why the ratings fall where they do.
In the package we scanned
No package has been scanned for this app, so nothing is published about what it ships. That is an absence of evidence about the app, not a finding about it.
Graded bands · predicate set 1.4 · how these are measured
What the analysis found
App-specific findings, grouped by what each one rests on. How they are graded lives on its own page.
Positive evidence 1
Things this app does right, published at the same strengths as the catch list.
Developer says data deletion can be requested
The developer's data-safety disclosure on the store states that users can request deletion of their data, or the app's own text offers a way to delete the account. This restates what the developer declares; it is not a test of whether deletion works. Apple publishes no equivalent disclosure, so on an Apple-only listing only the app's own text can support it.
What we saw: The developer's store data-safety disclosure states that data deletion can be requested; we have not seen a deletion control in the app's own text
One source only — shown, not confirmed 1
A single kind of evidence. We publish these because withholding them would be the bigger distortion, and we do not treat any of them as a finding we stand behind.
Reported by users: Upgrade prompts use guilt-trip wording
Declining an upgrade is written as a loss ('No thanks, I don't want to improve'), or users report being repeatedly pushed to subscribe during normal use.
What we saw: Constant upsell pressure: raised by 5 distinct reviewers (1.2% of 414 reviews scanned)
Highlighted reviews
Representative public review excerpts shown as user reports, not Appworthy audit evidence.
“Paid for Canada and US charts Aug 2025 and now its saying I need to buy the updated version and app is barley functional now and constantly asks me to pay $50 again for the 'updated' charts. I was under the impression it is supposed to be…”
“Scam warning! I paid for maps of North America. No maps, it just keeps prompting me to buy again. Emailed support many, many times, no response.”
Assessment & version history
App changes and Appworthy events in one timeline.
Store listing updated to version 296.0.
What this app sells
Useful store-disclosed pricing, kept below the app listing.
Items shown0
Lowest—
Highest—
Google Play does not publish per-purchase prices.