Comparison

DriftWatch vs TZ iBoat

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

DriftWatch

This navigation app helps boat captains sleep soundly by monitoring anchor drift. It uses your device's GPS to alert you if your vessel moves outside a set boundary, providing peace of mind while at anchor.

Highlights
  • Anchor drift monitoring
  • GPS boundary alerts
  • Audible alarms
  • Battery level monitoring
  • Simple and easy to use
Read full description

DriftWatch is a captain's best friend for a good night of sleep. Often the captain sets anchor for the night and keep waking up regularly to confirm that the anchor is still preventing the boat from drifting. Some boats/yachts have anchor alarm on their GPS system. Unfortunately, it is not rare that the integrated GPS system is inaudible from the captain's bed. With DriftWatch running on your IOS device, you can have it near your bed and be confident that it will warn you if you drift outside of the established boundary. DriftWatch is the perfect complementary mean that provides peace of mind when anchored. DriftWatch is simple and easy to use. --------------------------------------------------------------------------------------------- Note: Your IOS device should be connected and charging when using DriftWatch for an extended period of time either as a foreground or background application. The application keeps monitoring your location using the device's GPS which drains the battery faster than normal. Fortunately DriftWatch monitors your battery level and alerts you when a certain battery level is reached when unplugged.

About

TZ iBoat

Navigate the seas with advanced marine charts, GPS, and AIS data, even offline. This app offers detailed bathymetry, community-contributed map data, and dynamic features for safe boating, sailing, and fishing.

Highlights
  • Offline marine charts
  • GPS and route planning
  • AIS Online tracking
  • Community map contributions
  • Dynamic mooring and lighting
  • Advanced fishing tools
  • Tides and tidal currents
Features
Read full description

Your next-generation chartplotter. Navigate with the world’s #1 marine charts app for coastal boating, sailing, and fishing. Marine GPS, nautical charts, AIS Online, tides & tidal currents, anchoring, marine weather, radar, sounder, and NMEA data — everything you need for safer navigation at sea. Built for sailors, boaters, and fishermen who need reliable navigation anywhere, online or offline. THE SMARTEST AND CLEAREST NAVIGATION INTERFACE AT SEA A cutting-edge interface makes navigation clearer and faster: • TZ Bar: quick access to key features • Dedicated screens: Weather, Fishing, NavData, Logbook, Mooring, Tides, Sounder • Cleaner chart view, easier to read • Customizable interface for faster access • Modern design focused on readability WHAT YOU CAN DO WITH TZ iBoat • Navigate with marine GPS and nautical charts • Monitor AIS targets locally and globally • Plan routes and anchor safely • Access tides, currents, and weather forecasts • Fish smarter using oceanographic data FOR SAILORS & BOATERS – Navigate safely • TZ MAPS: vector, raster, satellite, and bathymetry charts • SMART SEARCH: find marinas, buoys, tide stations, routes • DYNAMIC LIGHTS: real-time light sectors • DYNAMIC MOORINGS: wind-aware anchorage • Precise GPS for coastal navigation AIS & SAFETY – Stay aware beyond your horizon • AIS ONLINE: global AIS targets via internet (Essential plan) • Share AIS data with the community • Radar and onboard instrument integration • Real-time traffic awareness for safer navigation FOR FISHERMEN – Gain the edge Turn ocean data into real fishing results: • Identify productive zones using SST, chlorophyll, currents, altimetry (Elite plan) • Spot fish-holding conditions faster • BATHYVISION: high-resolution bathymetry with contour lines • Target high-potential areas with precision • EVENT & CATCH: log and analyze catches on nautical charts WEATHER – Clearer and more useful • Dedicated Weather screen • Real-time forecasts and offline access • Rain Radar with lightning data • High-resolution models available in Premium plan • Iridium GO! compatibility CONNECTIVITY & PRECISION • NMEA connectivity: manage and prioritize data sources • Connect AIS, radar, autopilot, and instruments • Latitude/longitude keyboard optimized for use at sea • Easy coordinate entry with multiple formats COMMUNITY & ECOSYSTEM • COMMUNITY MAPS: share local knowledge (hazards, POIs, marinas) • Contribute and improve charts • Trusted by 500,000+ boaters worldwide SUBSCRIPTION PLANS Choose the plan that fits your needs: • Essential: AIS Online, onboard instruments, autopilot integration via Wi-Fi NMEA • Premium: Essential + high-resolution forecasts, Rain Radar, multiple models, comparison • Elite: Premium + ocean layers (SST, Chlorophyll, SSH, Currents). Monthly and annual plans available, with savings on yearly options. Core features remain available for free. CHARTS AND DATA PLANS SUBSCRIPTIONS: The payment will be debited from the Apple account once the purchase is confirmed. The subscriptions and automatic renewals can be managed by entering the account settings after making the purchase. Any unused part of a free trial period, if offered, will be lost when a subscription is purchased. Terms of use: https://mytimezero.com/eula/ Privacy policy: https://mytimezero.com/privacy-statement/

Screenshots

DriftWatch4 screens
TZ iBoat4 screens

Verdict

The call

The clearest difference is update cadence: TZ iBoat at every 8 days against DriftWatch's every 12 months. TZ iBoat also leads on review sentiment (79% vs 67%) and chart position (#86 vs unranked). On price, ads, in-app purchases and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. DriftWatch sells 3 in-app purchases, starting at $3.99 per year and TZ iBoat sells 10 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

DriftWatch ships an update every 12 months, TZ iBoat every 8 days. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

Scorecard4 real differences · 7 level
DriftWatch versus TZ iBoat: the parameters behind the verdict, then further details
ParameterDriftWatchTZ iBoat
PriceFreeFree
Rating—4.6 (886 ratings) — better
Positive reviews66.7% of reviews79.4% of reviews — better
Number of ratings—886 — better
Update frequencyEvery 12 monthsEvery 8 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank—#86 — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.414.2 — better
Further details — not scored
Size85 MB428 MB
Age rating4+4+
DeveloperRene DacierNobeltec, Inc.

Customer experience

DriftWatch

Written reviews3 reviews
Positive66.7%
Neutral33.3%
Negative0.0%

TZ iBoat

All ratings885 ratings
Positive91.5%
Neutral3.2%
Negative5.3%
Written reviews394 reviews
Positive79.4%
Neutral7.4%
Negative13.2%

Bugs and requests

DriftWatch

Not enough reviews yet to summarise bugs or requests.

TZ iBoat

Reported bugs

3 issues
  • GPS position not updating reliably while moving
  • Radar overlay not functioning properly
  • Compatibility issues with older devices or iOS versions

Requested features

5 requests
  • Automatic routing and trip planning
  • Improved satellite imagery and overlays
  • Better integration with other marine electronics
  • More customization options for data displays
  • Ability to mirror camera feeds as a rear-view

In-app purchases

3 purchases

DriftWatch

Subscriptions3
  • Remove Time Limit3 Days trial$3.991 Year
  • 24H Wind Forecast3 Days trial$9.991 Year
  • 24H Wind Forecast.3 Days trial$9.991 Year
10 purchases

TZ iBoat

Subscriptions8
  • Essential Subscription$2.991 Month
  • Premium Subscription$9.991 Month
  • Great Lakes7 Days trial$19.991 Year
Show 5 more
  • Canada West7 Days trial$19.991 Year
  • USA7 Days trial$19.991 Year
  • Bahamas7 Days trial$30.991 Year
  • Central America & Caribbean7 Days trial$30.991 Year
  • Elite Subscription$39.991 Month
One-time2
  • AIS module$8.99
  • Radar module$49.99

Questions

Is DriftWatch free?
DriftWatch is free to download, with in-app purchases available.
Is TZ iBoat free?
TZ iBoat is free to download, with in-app purchases available.
Do DriftWatch or TZ iBoat have ads?
Neither DriftWatch nor TZ iBoat shows ads.
Which is updated more often, DriftWatch or TZ iBoat?
DriftWatch ships an update every 12 months, and TZ iBoat every 8 days. Most recently, DriftWatch was updated on November 1, 2026 and TZ iBoat on November 4, 2026.

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