# CoNav — Deck Officer's Tools

> Offline maritime navigation and calculation tools for deck officers. (iPhone/iPad app by Vladyslav Yarmak.)

- Source: https://appshunter.io/ios/app/conav/id1456729642 (this page in markdown: same URL + `.md`)
- Developer: [Vladyslav Yarmak](https://appshunter.io/developer/1456545549)
- Category: Navigation
- Price: $6.99
- Rating: 4.00/5 from 6 App Store ratings · 96 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 17 MB
- Languages: American English
- Released: 2019-03-24
- Data updated: 2026-09-07
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/conav/id1456729642/reviews.md

## What is CoNav?

Deck Officer's Tools:

- Compass Error Calculation
- Celestial Navigation
- E.T.A Calculation
- Port UN LOCODE
- Units Converter
- True Wind Calculation

The app runs offline and all calculations are done within the app using precise and sophisticated algorithms.

Compass Error Calculation

64 Celestial Objects.
Precise bearing and altitude.
Automatic calculation of magnetic variation.
Complete calculation according to all requirements.
Suitable for all types of ship logs.
Hiding celestial objects below the horizon is available.

Celestial Navigation

Three position lines for calculating the ship's position.
A function is available for mapping the lines of position and the calculated position of the vessel.
The sunrise and sunset function is available as well as Twilight Nautical and Twilight Civil.

E.T.A Calculation

High precision
Great user interface
Vessel speed adjustment function

Port UN LOCODE

18,000 seaports
Brief information on the seaport

Units Converter

15 Dimensions
Volume
Length
Angle
Mass
Temperature
Speed
Duration
Area
Power
Pressure
Frequency
Energy
Electric Resistance
El. Potential Difference
Electric Current

This app will save you a lot of time and allow you to steer your boat even more safely.
If you have questions or suggestions, please email yvvofficial@yahoo.com or on the Instagram page conav_.

## Key features

- Compass Error Calculation
- Celestial Navigation
- ETA Calculation
- Port UN LOCODE Database
- Units Converter
- True Wind Calculation
- Offline Functionality

## Chart rankings

- #111 in Top Paid · Navigation (US App Store)

## Recent user reviews (10 of 96)

All indexed reviews: https://appshunter.io/ios/app/conav/id1456729642/reviews.md

### 2/5 — Celestial navigation is a complete disaster!

*2026-07-19, version 2.6.2*

I put 2 stars just for compass error calculation. In celestial navigation there are too many mistakes with GHAs, Semidiameters and increments. If you want app to help you with celestial observations I don’t recommend it. So don’t buy it. I understand if it was free but it’s not. And all these mistakes are unacceptable!!!

### 5/5 — Additional Option

*2026-07-13, version 2.6.2*

Please add option to toggle dark and white mode. Sometimes its hard to use outside especially when taking sun's error. Because the default is always dark. Thanks a lot

### 5/5 — Wonderful app

*2026-07-06*

Perform an update to the geographic coordinate conversion feature, with particular emphasis on conversions from UTM to WGS84.

### 4/5 — ..

*2026-06-01, version 2.6.2*

Why is the gyro error always 0.0? Great app btw

### 5/5 — Usefull

*2026-04-30, version 2.6.2*

Awesome

### 5/5 — Thank you

*2026-03-25, version 2.6.0*

Many thanks for time saving 🙏🏻

### 3/5 — ETA calculator inaccurate

*2026-03-22, version 2.6.0*

ETA calculator inaccurate

### 5/5 — Wind

*2026-02-22, version 2.4*

Приложение супер, лучше для айфона нету, поправку считает четко, проверял с альманахом, все сходится, маленькая просьба, а можно ли добавить ввод скорости судна в ручную, иногда 14,5 узлов скорость, для более точно расчета ветра, мелочь но будет приятно) - спасибо добавили вы лучшие!!

Ещё одна просьба, а возможно в конвертер добавить солёность воды, допустим 1.030 в  ppt - 40, для Канады и других портов считать.

Пользуюсь постоянно всеми функциями, пока самое нужное приложение, есть ещё идеи.)

### 5/5 — Feedback

*2025-12-13, version 2.5.9*

All working good

### 5/5 — Amazing

*2025-12-05, version 2.5.9*

Thanks to all your efforts! It’s the best application so far in use of Navigation and log recordings. Thank you very much! You saved so much time for us sailors

## Frequently asked questions about CoNav

### What is CoNav?

CoNav is a suite of offline tools for deck officers, offering features like compass error calculation, celestial navigation, and ETA calculations. It aims to enhance safety and efficiency in maritime operations.

### Does CoNav work offline?

Yes, CoNav runs entirely offline. All calculations are performed within the app using sophisticated algorithms, ensuring functionality even without an internet connection.

### What devices support CoNav?

CoNav is currently supported on iPhone devices. The app was last updated on February 24, 2026, with version 2.6.0.

### How much does CoNav cost?

CoNav is a paid application, priced at $6.99. There are no in-app purchases or advertisements associated with this app.

### What kind of calculations does CoNav offer?

CoNav offers a wide range of calculations including compass error, celestial navigation with three position lines, ETA, unit conversions across 15 dimensions, and true wind calculation.

### Is CoNav suitable for beginners?

CoNav is designed for deck officers, implying a certain level of maritime knowledge. However, its comprehensive tools and offline capability make it a valuable asset for professionals.

### How often is CoNav updated?

The latest version of CoNav is 2.6.0, last updated on February 24, 2026. While specific update frequency isn't detailed, the app has seen consistent development since its release in 2019.

### What is the age rating for CoNav?

CoNav has an age rating of 4+, making it suitable for a broad audience. The app focuses on professional maritime tools.

## Version history (last 5 releases)

### 2.6.3 — 2026-07-22

Performance improvements.

### 2.6.2 — 2026-04-07

Performance improvements.

### 2.6.1 — 2026-03-31

Performance improvements.

### 2.6.0 — 2026-02-24

Performance improvements.

### 2.5.9 — 2025-10-16

Bug fixes, performance improvements.

## Apps similar to CoNav

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [DONIA](https://appshunter.io/ios/app/donia/id751225905) | 4.5 (31) | Free | Navigation |
| [C-MAP: Boating](https://appshunter.io/ios/app/c-map-boating/id967289980) | 4.5 (2,347) | Free | Navigation |
| [Nautical Calculator Pro](https://appshunter.io/ios/app/nautical-calculator-pro/id1455851003) | 5.0 (3) | $8.99 | Navigation |
| [MyShipTracking](https://appshunter.io/ios/app/myshiptracking/id1403038386) | 4.4 (4,487) | Free | Navigation |
| [Navarea Warnings (Navtex)](https://appshunter.io/ios/app/navarea-warnings-navtex/id1368856370) | 5.0 (1) | Free | Navigation |
| [COLREG](https://appshunter.io/ios/app/colreg/id6446209111) | — | $0.99 | Navigation |

## More apps by Vladyslav Yarmak

- [All Units](https://appshunter.io/ios/app/all-units/id1663552827)
- [Sea Breeze](https://appshunter.io/ios/app/sea-breeze/id6445898579)
- [CVoyager](https://appshunter.io/ios/app/cvoyager/id6502268141)
- [Finka](https://appshunter.io/ios/app/finka/id6741692737)
- [Neira](https://appshunter.io/ios/app/neira/id6742567740)

All apps by Vladyslav Yarmak: https://appshunter.io/developer/1456545549

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-07.*