iNavX and iSailor offer more functions

The year 2015 barely begun, developers already deliver us their applications developments, probably developed between two glasses of champagne during the holidays. I consider iNavX and iSailor as the two best navigation apps so far under iOS. These are the ones that offer the most extensive functions and the choice of the best maps. They each have their qualities and their faults, and I took advantage of the innovations introduced by their recent update to attempt a quick comparative price/functions.

Warning, this exercise is associated with a snapshot vision, valid today but quickly obsolete tomorrow, as changes are rapid in this domain. On the other hand it is always difficult to share the objective and subjective aspects in a comparative, I was already confronted in the past (¹).

iNavX 4.1.3

This version, delivered for a few days, essentially adds some improvements to the many functions already present.

  • Graphic meteogram

Associated with weather display option provided as optional with (²), a tap anywhere on the chart when the forecasts are displayed provides access to data meteogram for this location. The choice of units is made in the application preferences.

  • Export of waypoints, routes and tracks files

In addition to transfers to the X-Traverse account that allows to save these data, iNavX allows exporting using the "Open in" function, via AirDrop, and also to iCloud Drive (If activated in the settings of the device).

  • Barometric pressure

With the iPhone 6 and 6+ appeared a built-in atmospheric pressure sensor. iNavX displays the barometric 'BPR' pressure in instruments banner, with a graphic zoom recording the pressure of the last 24 hours.

iSailor 1.7.2

This version provides new options by subscriptions and improvement claimed for a long time : the ability to enable and disable the display of lights sectors on the chart.

  • Tides and tidal currents

The tides in iSailor is calculated on the basis of four main harmonic and corrections in shallow water. The calculation process is based on the Simplified Harmonic Method of Tide Predictions which can be found in various publications, as the Admiralty Tide Tables (The British Admiralty tide tables). It is clarified that the results of this method can introduce "minor differences" with the official tide tables. It's an option per yearly subscription.

  • Navigation guides

They contain all the marinas, commercial and fishing harbours, and the moorings of a geographical area, includes detailed information as the means of contact (VHF, phone, email, web site), facilities, access, etc. Navigation guides are accessible via a new tab of the lateral drawer. The first two available areas are the Mediterranean and the Caribbean. Sites are represented on the chart by specific icons, a tap for accessing information in the lateral drawer. Each guide is an option per yearly subscription.

Features comparison

Both applications offer the same basic functions. In addition to the management of waypoints, routes and tracks files, We find the alarms and alerts enough complete (waypoint enabled, anchor, AIS, WiFi connection, aso.) but with a significantly different treatment. Functions’import/export are much more numerous in iNavX, as well as chart display settings that provide a much wider range of options.

The Chart management (purchase, download, update) is much easy with iSailor, since the purchases are integrated (in-app). In contrast to iNavX where purchases via the X-Traverse server are a real headache for users.

About advanced functions, NMEA interface, support AIS, data rate Weather, the prize goes to iNavX that showed from the beginning a desire for integration with all navigation instruments, using NMEA0183 and NMEA2000 support and TCP/IP protocol. A request and display feature of GRIB weather files via X-Traverse , or via Saildocs Server with Mail or satellite messaging (Iridium, XGate). iNavX does not directly provide the tides calculation, but to interface with the application AyeTides offering the heights of water from 10.000 stations in the world. iSailor offers connections NMEA0183, but limited to navigation instruments : GPS, Wind, Sounder, AIS. However the option Tides & Current displays vectors of currents on the chart with direction and instant speed in real time. Remains to check the accuracy.

Both applications converge on the management and the display of the AIS targets, with CPA/TCPA calculation, ROT, approach alarms. Receipt of AIS can be done via NMEA in direct connection to the instruments (receiver or transceiver) or by Internet reception.

Finally a fundamental difference concerns charting, which I will discuss below : iNavX proposes the use of a major charting catalogue from different publishers, vector charts with Navionics, Raster with others. iSailor offers only TX-97 vector charts from its publisher Transas.

Concerning the two user interfaces, i.e. ergonomics, I'd rather not say. The appreciation of one or the other is too personal. Let's rather talk about the price, much more objective comparison.

All inclusive prices

Two economic models are opposed : a paid application, but whose (nearly) all advanced features are provided, and a free application where (nearly) all advanced features are paying. Let the best one win ! Warning, these starting prices 2015 are a snapshot, they are likely to change in the future.


For the comparison to be consistent, I will only compare vector maps Navionics (iNavX) and Transas TX-97 (iSailor).

Regions area are much more fragmented with Transas than with Navionics. For a comparison to be valid, must be considered equivalent geographical areas. Not easy. In addition, large areas of Navionics penalize mariners attending only limited coastal areas, while the addition of reduced areas with Transas penalize those who cross vast areas. Take two examples concerning the Western Europe and the Western Mediterranean.

To obtain the equivalent of the region Europe Navionics 46XG ($80 ± 69 €) should be added 175 € Transas charts ! But all boaters navigate not the Belgium to the Azores and the Canary Islands to Corsica. Knowing that each European charting area is sold 25 €, for the price of a Navionics 46XG I can buy almost three Transas charts region, for example South England + Channel + Atlantic up to Vigo. What will largely suffice to many boaters.

To obtain the equivalent of the region Mediterranean Navionics 43XG ($80 ± 69 €), should be added 150 € Transas charts region, not exceeding the Turkey coasts. Yet once everyone will not sail in Greece, but even must pay 75 € to cover the French coast, Balearic Islands, Corsica and Sardinia, preferred destinations by our compatriots.

Regardless of the quality of these charts, on which I already adequately expressed myself (³), It can be seen that prices, despite a misleading division, are virtually equivalent to geographical areas of an area normally frequented by a majority of boaters. Navionics will be more affordable for those who sail the high seas, and Transas for small coastal shipping. But overall it stands.

At last, important precision : the Navionics charts must be renewed every year, in order to continue to update, at the initial purchase price. It is therefore neither more nor less than to a subscription (in which no one is obliged to subscribe). So far, Transas charts are updated for free since the beginning, what would not last forever.

(¹) iNavX or Navionics Marine [Updated]
(²) iNavX 3.6.1 with high-resolution GRIB files
(³) https/


16 Replies to “iNavX and iSailor always offer more functions”

  1. Hello,

    Update this morning to iSailor… and surprise, more interconnection with Weather4D PRO…

  2. The bug found about records of road on Icloud comes to be corrected.
    It can again be in GPX or KML.
    Thanks for your intervention with the developer.

  3. Thanks Francis, by constant information you send us. I wish you a happy days you spend in the new year which begins in is sea that we witnessed the birth. Receive a cordial greeting.

  4. Hello

    Having discovered there is little able to navigate with Ipad, I inquired on your blog.

    However I realize that this is very complex and I Kings understand sometimes and I see I am missing elements to answer certain questions as : What applications are necessary to navigate and be autonomous? The card holder, the global marine maps, updates, etc…..
    Thank you in advance for your answers.
    I own an ipad 2 WiFi cellular (is this enough to rotate the card reading system and geolocation?)

  5. Hello,
    As merchant marine captain, I did an internship on Transas ECDIS in Southampton in 2012.
    I would like to use the application iSailor on iPad, I also have an iPhone.
    Is it possible to use cards purchased on both devices at the same time collection?
    Or should he buy a collection for the Ipad and another for the Iphone?
    Thank you and good weekend

    1. Yes, the cards are “in-app” purchases therefore usable on several media with the same iTunes ID. Subscriptions require an active Drive iCloud account.

  6. Hello Francis,
    Thanks for this post.
    I note that with the shift 4.1.3 that I have, I am more able to save the data in Icloud drive. In my previous version this function was visible under open in…/ Airdrop
    Now it has disappeared !!!!
    A bug in this version ?

  7. Patch about the coverage of the Navionics for iNavx maps that do not cover the southern part of the Indian Ocean.

  8. Hello Francis,
    Thanks for this quick review. FYI, I've tried the four apps for iOS now 4 years: it comes to iNavX, iSailor, Plan2Nav and SEAiq, This during our navigations of the Chile until New Zealand.
    I gave Plan2Nav pretty quickly, comparison of mapping with the competitors being proved against.
    I have long had a preference for iNavX, but the evolution of iSailor and SEAiq attached to the trade policy of X-traverse, led me to use that the latter. For example, I had acquired in 2013 mapping for New Zealand (33XG) reserving the purchase of the rest of the trip for the following years. When I wanted to buy the Australia mapping (32XG) in 2014, I learned that these two maps had been grouped under a single (50XG), and that I had to buy new Zealand in order to have the Australia. Finally and most important, Navionics mapping does not cover the Indian Ocean!
    My use of iNavX will therefore stop in New Caledonia.
    Regards iSailor, and unless I am mistaken, the options called "NMEA" are not by subscription, but are at a fixed price.
    At last, the purchase of maps iSailor for the rest of our trip from Brisbane has Barbados, cost me€ 100.

    1. Thanks Alain, you're perfectly right, time for me, NMEA interfaces are well fixed price. It's fixed. It can actually crossing the Indian Ocean with the 31XG then the 30XG before rebounding with the 3XG on the Brazil and the Caribbean. Now the 50XG covers all over the Pacific, including Australia and New Zealand for 80$.

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