Navigation Rules
by Calculated Industries
- Reference
- Paid
- Zombie
- Rating
- 4.8
- 389 ratings · US storefront
- Top 82%among 93 Reference apps
- Last update
- Dec 7, 2021
- Version 4.1.9
- Size
- 37 MB
- Category
- Reference
- Tracked since
- Oct 9, 2026
Estimated revenue
A model estimate with a likely range, not a reported figure.
No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.
How this estimate is made
Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.
Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.
Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.
Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.
Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.
Full methodScreenshots
As shown on the App Store listing.
About this app
Text from the App Store listing.
Navigation Rules contains a complete copy of the International Regulations for Preventing Collisions at Sea, 1972 (COLREGS), including amendments and the Inland Navigation Rules, in effect for all inland waters, including the Great Lakes. App is COLREGs most recent version dated - June 28th, 2019.
This app includes an annotated table of contents and a search function to help the reader quickly find the rule and related references. A Favorites page allows quick access to commonly referenced pages. Use the email function to share a page with others.
If you are a boater you need to know this information.
You might also be interested in our other boating apps:
- Boater’s Pocket Reference
- Boating Calcs
- Seamanship
- Ship Captain's Medical Guide
What’s new
Release notes for the latest version, as written by the developer.
Fix to Fishing Vessels Engaged in Fishing - Rule 26
Rank history
Daily position in the St. Kitts & Nevis charts. #1 is at the top.
- Best rank
- #5
- Current rank
- #5
- Days charting
- 7 of 7
On the charts today
Small & simple score
How realistic it is for a small team to build something like this.
75/100
Not flagged as small & simple
- Developer size0% · 25
Developer: 32 apps on the charts
- Audience size100% · 20
Ratings: 389
- App size100% · 10
Size: 37 MB
- Price model100% · 15
Price model: paid
- Demand proof100% · 30
Best rank #5, 37 countries
An indicator, not a fact. We can't see team size. Calculated Oct 24, 2026 · method i2
How the score worksVersion history
- 4.1.9LatestReleased Dec 7, 2021