# Sight Calc vs Aqua Map Boating

The clearest difference is price: Aqua Map Boating at Free against Sight Calc's $1.99. Aqua Map Boating also leads on update cadence (weekly vs every 11 months) and ratings volume (14K vs 7). Sight Calc's advantage is in-app purchases (none vs 17) and rating (5.0 vs 4.7). On ads, device support and iOS requirement there is nothing between them.

Aqua Map Boating is free to download; Sight Calc costs $1.99 up front. Aqua Map Boating sells 17 in-app purchases, starting at $4.99 per year. Sight Calc asks for nothing beyond the download.

Sight Calc holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Aqua Map Boating has 14K ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 82% of Sight Calc's written reviews are positive against 64% of Aqua Map Boating's.

Sight Calc ships an update every 11 months, Aqua Map Boating weekly. The most recent releases landed on October 15, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Sight Calc | Aqua Map Boating |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/sight-calc/id497809138/reviews)** | [4.7 (14K ratings)](https://appshunter.io/ios/app/aqua-map-boating/id919552329/reviews) |
| Number of ratings | 7 | **14K** |
| Positive reviews | **82.4% of reviews** | 64.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Weekly** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | — | **#89** |
| Size | 1 MB | 174 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [NUVOCOM INCORPORATED](https://appshunter.io/developer/497809141) | [GEC s.r.l.](https://appshunter.io/developer/675562886) |

## What reviewers say

### Sight Calc

[App page](https://appshunter.io/ios/app/sight-calc/id497809138)

This app is a specialized calculator for sight reductions using the Law of Cosines method. It's designed for students learning celestial navigation and requires manual input of LHA, declination, and approximate latitude.

**Highlights:** Law of Cosines sight reduction, Manual LHA, declination, and latitude input, Input as degrees/minutes or decimal degrees, Continuous computation of Hc, Z, and Zn, Supports North/South latitude and declination conventions, Clear and clear entry functions, Convert minutes to decimal degrees

**Features:** macOS Compatibility

**In-app purchases:** none


### Aqua Map Boating

[App page](https://appshunter.io/ios/app/aqua-map-boating/id919552329)

**Currently charting:** #89 Top Grossing · Navigation (US App Store)

This app provides official, weekly updated nautical charts for marine navigation. It allows for offline map downloads, GPS track recording, and integration with onboard instruments. Enhance your boating safety and experience with advanced features like weather forecasts and AIS collision detection.

**Highlights:** Official NOAA nautical charts, Offline map downloads, GPS track recording, Tides and currents predictions, Anchor Alarm, NMEA instrument connectivity, AIS with collision detection

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (17)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Florida - NOAA Nautical chart | $4.99 | per year |
| Alabama to Texas charts | $4.99 | per year |
| Cape Cod to Chesapeake Charts | $4.99 | per year |
| New England - Nautical charts | $4.99 | per year |
| Virginia to Georgia - Charts | $4.99 | per year |
| Midwest-Minnesota lake charts | $4.99 | per year |
| Michigan & Great Lakes chart | $4.99 | per year |
| US - Nautical & Lakes charts | $9.99 | per year |
| Canada - nautical charts | $9.99 | per year |
| US & Canada - nautical charts | $14.99 | per year |
| Caribbean South Nautical chart | $14.99 | per year |
| Bermuda - nautical charts | $14.99 | per year |
| Aqua Map Expert | $14.99 | per year |
| Aqua Map Master | $24.99 | per year |
| Bahamas - Explorer Charts | $49.99 | per year |
| US & Canada - Nautical chart | $49.99 | one-time |
| Bahamas - Explorer Chartbooks | $139.99 | one-time |

**What reviewers like**

- 🚀 Excellent navigation tool
- 👍 Easy to use and intuitive
- 🗺️ Detailed and accurate charts
- 💡 Helpful features like AIS, weather, and fuel prices
- 🤝 Responsive and helpful customer support

**What reviewers complain about**

- 🐛 Occasional issues with map downloads and disappearing charts
- 🔍 Lack of intuitive route planning functionality
- 🔍 Slow map loading and tracking issues in certain areas
- 💰 Subscription model with additional costs for map downloads

**Reported bugs**

- Inconsistent GPS tracking and positioning
- Compatibility issues on older devices

**Requested features**

- Improved route planning and optimization
- Offline map caching and seamless downloads
- Tidal and wind data overlays
- Sync capabilities across devices


## Frequently asked questions

### Is Sight Calc free?

Sight Calc costs $1.99, with no in-app purchases.

### Is Aqua Map Boating free?

Aqua Map Boating is free to download, with in-app purchases available.

### Which has better reviews, Sight Calc or Aqua Map Boating?

Sight Calc is rated higher. Sight Calc averages 5.0 out of 5 from 7 ratings, while Aqua Map Boating averages 4.7 from 14K ratings.

### Do Sight Calc or Aqua Map Boating have ads?

Neither Sight Calc nor Aqua Map Boating shows ads.

### Which is updated more often, Sight Calc or Aqua Map Boating?

Sight Calc ships an update every 11 months, and Aqua Map Boating weekly. Most recently, Sight Calc was updated on October 15, 2026 and Aqua Map Boating on October 18, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*