Comparison

NVS Explorer vs Anchor Pro

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

Head to head
About

NVS Explorer

Access real-time ocean data for the Pacific Northwest. Visualize conditions from various observing assets, view historical data plots, and share findings via email or SMS. Customize units and save favorite assets for quick access.

Highlights
  • View real-time ocean data
  • Access 24-hour, 7-day, and 30-day data plots
  • Share data plots via email or SMS
  • Searchable list of observing assets
  • Save favorite observing assets
  • Display data in scientific or common units
  • Data plots for tuna fishers
Features
Read full description

Welcome to the Northwest Association of Networked Ocean Observing Systems (NANOOS) Visualization System (NVS), your tool for easy access to data for Pacific Northwest waters, from California to British Columbia. NANOOS is a regional member of the U.S. Integrated Ocean Observing Systems (IOOS) program and is funded by the National Oceanic and Atmospheric Administration (NOAA) to provide this service. NVS displays data from a diversity of providers, including federal, tribal, state, academic, industry and non-profit organizations, who operate a wide variety of observing assets such as buoys, shore stations, sea-bed and coastal land-based stations. This composite view provides a more comprehensive view of ocean conditions. NVS allows you to browse through a map of all NANOOS observing assets. You can then look at the most current data available, or obtain a plot of the last 7 days. Plots can be saved to your phone or iPod. Plots can shared by either email or SMS. FEATURES: o View the most recent data from all NANOOS observing assets o View 24 hour, 7 day and 30 day plots of data for trends in conditions o Share plots via Email or SMS o Searchable List view of Observing Assets o Favorites o Data display in either Scientific or Common Units o Plots for Tuna Fishers

About

Anchor Pro

This app helps boaters set and monitor their anchor position in real-time. It allows for defining safe zones, tracking boat movement, and receiving alerts for critical changes. Remote notifications and Apple Watch integration enhance its utility for secure anchoring.

Highlights
  • Set anchor location in real-time or manually
  • Define custom safe swing zones
  • Monitor boat movement and track history
  • Receive real-time alerts for position, GPS, and battery
  • Remote notifications via Telegram or email
  • Apple Watch companion app for key metrics
Features
Read full description

SET THE ANCHOR Set your anchor location in real time as you drop it, or specify it later by entering distance and bearing. Advanced users can also input exact coordinates. DEFINE THE SAFE ZONE Define the allowed swing area as a simple circle around the anchor, or create a more precise zone by setting two different radii at specific angles. MONITOR MOVEMENT Stay on top of every movement with comprehensive real-time data. Review key metrics on the main screen or switch to the map view to see your boat's track — ideal for analyzing whether your anchor is holding or dragging. GET ALERTED WHEN IT MATTERS Monitor position, GPS signal strength, and battery level — and receive alerts the moment any of these fall outside your set thresholds. REMOTE ALERTS Leave your phone on board and stay informed from shore. Receive alarm notifications via Telegram or email. With Telegram, you can also request a live status update at any time. APPLE WATCH Keep distance, bearing, and battery level on your wrist with the Apple Watch companion app — all updated in real time. TRY ANCHOR PRO FOR FREE Core features are always free. Want to explore everything? All premium features are available during a free trial period — no commitment required. Anchor Pro is ad-supported. Purchasing an Anchor Premium subscription removes ads and unlocks extra features. Payment is charged to your iTunes Account at confirmation. Subscriptions renew automatically at the same price unless auto-renewal is turned off at least 24 hours before the current period ends. You can manage auto-renewal anytime in your Account Settings. Anchor Premium is $6.99 USD/year (pricing may vary by country). Any unused portion of a free trial is forfeited upon purchasing a subscription, where applicable. Terms of use: https://links.ideaboys.net/anchor-ios-terms.html GOOD TO KNOW Anchor Pro uses background audio and location services to keep alerts active when the app is not in the foreground. Please note that continuous GPS use will drain your battery faster than usual.

Screenshots

NVS Explorer4 screens
Anchor Pro4 screens

Verdict

The call

The clearest difference is rating: Anchor Pro at 4.8 against NVS Explorer's 4.3. Anchor Pro also leads on ratings volume (3.5K vs 3) and review sentiment (80% vs 60%). NVS Explorer's advantage is in-app purchases (none vs 1) and iOS requirement (12.0 vs 17.2). On price, update cadence, ads and device support 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. Anchor Pro sells 1 in-app purchase, starting at $6.99 per year. NVS Explorer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Anchor Pro holds the better App Store score, 4.8 against 4.3. That said, the two scores are not equally well evidenced: Anchor Pro has 3.5K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 60% of NVS Explorer's written reviews are positive against 80% of Anchor Pro's.

UpkeepUpdate frequency

NVS Explorer ships an update every 3 months, Anchor Pro every 2 months. The most recent releases landed on June 11, 2026 and September 29, 2026 respectively.

Scorecard6 real differences · 4 level
NVS Explorer versus Anchor Pro: the parameters behind the verdict, then further details
ParameterNVS ExplorerAnchor Pro
PriceFreeFree
Rating4.3 (3 ratings)4.8 (3.5K ratings) — better
Positive reviews60.0% of reviews79.5% of reviews — better
Number of ratings33.5K — better
Update frequencyEvery 3 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS12.0 — better17.2
Further details — not scored
Size19 MB23 MB
Age rating4+4+
DeveloperNANOOS-IOOSASSOCIATIONIdeaBoys GmbH

Customer experience

NVS Explorer

All ratings3 ratings
Positive66.7%
Neutral33.3%
Negative0.0%
Written reviews5 reviews
Positive60.0%
Neutral40.0%
Negative0.0%

Anchor Pro

All ratings3,496 ratings
Positive96.5%
Neutral1.7%
Negative1.7%
Written reviews176 reviews
Positive79.5%
Neutral2.8%
Negative17.6%

Bugs and requests

NVS Explorer

Not enough reviews yet to summarise bugs or requests.

Anchor Pro

Reported bugs

2 issues
  • App randomly shuts off
  • Anchor position tracking glitches

Requested features

3 requests
  • Customizable anchor icon/color
  • Integration with marine GPS/chartplotter
  • Ability to adjust alarm parameters remotely

In-app purchases

None

NVS Explorer

No in-app purchases

1 purchases

Anchor Pro

Subscriptions1
  • Anchor Premium7 Days trial$6.991 Year

Questions

Is NVS Explorer free?
NVS Explorer is free to download, with no in-app purchases.
Is Anchor Pro free?
Anchor Pro is free to download, with in-app purchases available.
Which has better reviews, NVS Explorer or Anchor Pro?
Anchor Pro is rated higher. NVS Explorer averages 4.3 out of 5 from 3 ratings, while Anchor Pro averages 4.8 from 3.5K ratings.
Do NVS Explorer or Anchor Pro have ads?
Neither NVS Explorer nor Anchor Pro shows ads.
Which is updated more often, NVS Explorer or Anchor Pro?
NVS Explorer ships an update every 3 months, and Anchor Pro every 2 months. Most recently, NVS Explorer was updated on June 11, 2026 and Anchor Pro on September 29, 2026.

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