# NMEA Mapper 3D — Fish Finder Sonar & Bathymetry

> Fish Finder Sonar & Bathymetry (iPhone/iPad app by Savvas Petrou.)

- Source: https://appshunter.io/ios/app/nmea-mapper-3d/id6822377816 (this page in markdown: same URL + `.md`)
- Developer: [Savvas Petrou](https://appshunter.io/developer/480311109)
- Category: Navigation, Sports
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 141 MB
- Languages: American English
- Released: 2026-10-30
- Data updated: 2026-11-01

## What is NMEA Mapper 3D?

Turn the fishfinder you already own into a 3D map of the seabed.

NMEA Mapper 3D reads depth and GPS from your boat over Wi-Fi and builds a detailed 3D chart of the bottom as you drive: every ledge, drop-off, reef and pinnacle you pass over, saved privately on your phone. No new hardware. No subscription.

MAP THE SEABED IN 3D
• Press Record and watch the bottom take shape behind your boat, sounding by sounding
• Tilt, turn and zoom over reefs, wrecks, channels and drop-offs
• Depth colours or a textured seabed, with contour lines from 1 to 100 m, ft or fathoms
• See on the chart exactly where you have mapped, and dive into 3D anywhere you have been

LIVE DEPTH SONAR
• A fishfinder-style depth history over 1, 2 or 10 minutes
• Scroll back, tap any moment to see the depth and exactly where it was, then mark it
• The bottom ahead along your course, drawn from your own map
• Shallow-water alarm, minimum and maximum depth, water temperature

CHARTS & SEAMARKS
• Street chart or satellite view, with buoys, lights and harbour marks from OpenSeaMap
• Areas you have viewed are kept for use offline
• Follow your boat north-up or heading-up, and rotate the map with two fingers

MARK YOUR SPOTS
• Fish, schools, reefs, wrecks, hazards, anchorages and pins, with species, colour, notes and depth
• Distance and depth to every mark at a glance
• Import and export your marks as GPX

EVERY TRIP SAVED
• Each recording becomes a track with its depths, distance and time
• Share any track with its depths as GPX

CATCH LOG
• Species, length, weight, bait and a photo in seconds
• Depth, water temperature, moon phase and bite period are filled in for you
• Insights show what your best days have in common

BITE TIMES
• Solunar calendar with major and minor bite periods for your spot
• Sunrise, sunset, moonrise, moonset and moon phase
• Reminders before the next bite period

DEPTHS YOU CAN TRUST
• Set your transducer depth and keel offset, and show depth below the surface, transducer or keel
• Tide correction: automatic from nearby tide stations where available, or set by hand

WORKS WITH YOUR BOAT
NMEA Mapper 3D connects to any NMEA 0183 source over Wi-Fi (TCP or UDP): a Wi-Fi gateway or multiplexer, or a chartplotter or fishfinder with Wi-Fi NMEA output. NMEA 2000 networks work through a gateway that sends NMEA 0183 over Wi-Fi. The app finds your source automatically and reads depth (DBT, DPT), position, speed and course (RMC, GGA, GLL, VTG), heading (HDT, HDG, HDM) and water temperature (MTW).

For accuracy, depths are recorded only with GPS from your boat's NMEA feed. Without it, your phone's GPS still shows where you are on the map.

YOUR DATA STAYS YOURS
No account and no uploading. Your maps, marks, tracks and catches stay on your device.

FREE TO USE
Every feature is free, supported by ads. Remove the ads for good with a one-time purchase. No subscription.
Day, dusk and night display modes. Metres, feet or fathoms. iPhone and iPad.

Important: NMEA Mapper 3D is a fishing and mapping aid. It is not a certified navigation system and does not replace official nautical charts, a chartplotter or good seamanship.

## Is NMEA Mapper 3D safe?

Not enough ratings yet to assess NMEA Mapper 3D.

## Is NMEA Mapper 3D legit?

NMEA Mapper 3D appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for NMEA Mapper 3D is 75 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-30

No release notes.

## More apps by Savvas Petrou

- [Range Finder: AI Distance](https://appshunter.io/ios/app/range-finder-ai-distance/id481383793)
- [iShaver PRO](https://appshunter.io/ios/app/ishaver-pro/id544451343)
- [Compass-PRO](https://appshunter.io/ios/app/compass-pro/id551376288)
- [Birds Mimic](https://appshunter.io/ios/app/birds-mimic/id588220823)
- [Range-Finder](https://appshunter.io/ios/app/range-finder/id891718293)
- [Achilleus 3D Tactical Map](https://appshunter.io/ios/app/achilleus-3d-tactical-map/id946169237)

All apps by Savvas Petrou: https://appshunter.io/developer/480311109

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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 2026-11-01.*