iNavX on the iPad
A Beta tester’s point of view
I haven’t been this excited since since I was a kid waiting for Christmas. The big present was the new 64GB iPad 3G. When Apple made the first announcement, I knew that this could be a solution
to navigation on boats. Not only did I know this, but developer of iNavX marine software for the iPhone, Rich Ray also knew this to be a fact. I have been a Beta tester for him since the early days of GPSNavX, MacENC and iNavX. I knew that iNavX would scale perfectly to the iPad, and that was Rich’s full intention.
As the six weeks of waiting spiraled down, Rich was very busy working on the new application. Unlike some other developers, he decided to keep this application a “universal app”, which means it will run on the iPad, iPod Touch or the iPhone. The consumer only has to pay once.
Finally delivery day for the new iPad was upon us. I personally met the FedEx lady and received the package. Rich wasn’t far behind and a couple of days later I had the first beta for the iPad.
Rich had taken full advantage of the added space that the iPad offers with a "Compass Banner"/ "Instrument Banner" on the top and a "Tab" menu bar on the bottom. The various charts display superbly on the bright sharp screen.
First things
The first thing I did was download all the charts I would need. This was done through XTraverse, an online supplier iNavX uses to move docs and charts back and forth. I was able to download Navionics and Canadian raster charts. (This app
was designed to display many different chart formats). I had previously downloaded the charts I would need from NOAA.
Adding new routes took a bit of learning, but not too bad once you get the hang of it. It is a simple matter of either showing all the waypoints you already have in iNavX (“settings”>toggle on/off on top of screen), and tapping on them to make up a new route, or creating new waypoints by tapping on the chart and selecting the "waypoint" button. A popup window appears asking you if you want to add to the route. Simply tap out your course.
At first blush the charts looked stunning on the iPad. You are struck with the clarity of viewing on the iPad’s 1024 x 748 pixel display. Apple has done a superb job on this screen making it viewable from the most oblique angles. The method of multitouch, making finger gestures on screen to get the desired information, made it a great experience. The iPad also has the advantage of portrait or landscape view. Up here in the Northwest, we do a lot of north and south cruising, making portrait view very useful.
Laying in a course
Now it is just a matter of tapping on routes and picking the one you want to navigate.
In this case we are going from Shelter Bay to Friday Harbor. Nuts, Wrong way! Okay, no problem. I simply touch on the route title which opens up Friday Harbor
to Shelter Bay, showing me all my waypoints (on each w/p, the degrees magnetic and distance). I hit the little roundabout arrow above, which reverses the route and I am ready to go. At page top, I hit the “go to” button and then in the upper left touch “Routes”. I touch "chart" in the Tab Bar and there I am. I have activated the my first route.
Getting under way
I felt the iPad would not be just an "in between" computer on your boat, as some have suggested. A correctly written program could be completely self-contained, fitting all your needs.
With that in mind, here is a typical trip.
First thing, get the iPad ready to go. Launch iNavX then... to the setup page (which is the first page that you will find in this program) and pick your desired chart. In this case, because of it’s simplicity, I pick the Navionics charts which covers the entire US, and are priced appropriately. The Pacific Northwest is my cruising grounds, so I pick Puget Sound. The chart loads up right away. I tap on “chart” and that forces the program to center on my vessel. One thing that I have learned, the GPS inside this iPad is not like the GPS in the iPhone. Although I have found that to be adequate, this is a superior unit. Even sitting inside my house, this GPS acquires a signal. It is much more sensitive, and I found the accuracy to be quite good.
We cast off the lines, and since this is a beta test, I am looking for any anomalies or problems
. As I come up on my first waypoint, I have the iPad propped up in a vertical position. As a side note, I made a small wooden tray, which consists of cutting a slot in a pice of wood, a half inch wide and 7/8" deep that the iPad sits in ... either vertical or horizontally, with a wooden base and soft rubber feet on the bottom, so it stays stable in my cockpit.
Getting from point A to B
I double click on the first waypoint I am approaching. Up comes a popover which gives me several options. The first one is “next Bouy 6” which advances to the next waypoint. As previously mentioned, if I were working with routes, it would allow me to add/edit this waypoint, zoom in, zoom out or activate tides andcurrents in my area. This current version of iNavX does not have auto next (as yet), so when I come upon a
waypoint, it is a simple matter of double tapping and hitting “next” to advance the w/p.
Since I have activated the instrument strip at the top, which is user selectable, I am now reading the COG (Corse over Ground), SOG (speed), XTE (my cross track error), BTW (bearing to w/p), DTW (distance to w/p) etc. I have the option to put in HPD so I can see just how valid my satellite signal is.
For this section of the trip, I have elected to use the iPad’s built-in GPS. The compass banner is taking direction from the GPS. (When HDG is set to “off” the compass reverts to GPS.)
Reflections
It will be an interesting test today because usually in the Northwest, you don’t have to worry about sun, as it’s normally cloudy, making screen viewing easier. However today is the exception with sunlight streaming in. I gave up a long time ago trying to see a laptop screen, or any other type of display in the cockpit. I finally broke down and bought a sunlight viewable display, which has worked beautifully on the boat.
Would the iPad work outside? Well here it sits right in front of me. Sunlight is hitting both the outdoor screen and the iPad. So far no problem viewing. It is a remarkable screen, the only problem is reflection, I might have to turn it a bit to keep a direct reflection off, but all in all very easy to read. If you take it out where the sun is hitting it directly, it's a challenge.
Right away I notice that my track is being laid down behind my course, and just for the heck of it, I switch over to the tracks page, where I can see that iNavX is keeping accurate account of my trip. My tracks can be imported and exported. I have stats, such as count, distance averaged, and elapsed time. If I tap on a track in the lower Tab Bar, up comes a popover that gives me that particular track, the date, Lat/Lon, speed over ground, and heading.
Instruments
I tap instruments on the Tab Bar. This allows me to pull up a page where data is prominently displayed. At a glance, I get to see all the instrumentation that I have previously selected in "set up". Interestingly enough, iNavX can take in any other NMEA source (think: wind, depth, speed... NMEA capable instruments). How did you get that data without a wire? Later.
Right now I want to take a look at my heading. I press on the line labeled HDG. It tells me that I am doing 225 degrees magnetic, in a popover that presents in a large beveled rectangle, very readable type (great for us who have stacked up a number of decades).
I am now about halfway through my trip. I notice a number of little things that might not be working quite as they should. I press the big home button at the bottom and type up an email complete with pics illustrating areas that need attention.
No wires
Its time to give TCP/IP a try. This is what makes iNavX
really shine. For this test I am using my MacBook running MacEnc using the TCP/IP feature. This allows me to take all the NMEA data piped into MacENC and transmit it wirelessly to the iPad. Since my iPad and my MacBook both have Wifi in them, Apple has initiated what they call ad hoc (special purpose) networking. I am able to set up my MacBook as an ad hoc transmitter, and my iPad as an ad hoc receiver. At this point I am transmitting all the data, (GPS and AIS ) over to the iPad. Back in iNavX on the iPad, I enter "set up" and I pick TCP/IP. I put in the IP address that I see on my MacBook, and hit the link button. I notice in the monitor that data starts streaming across my monitor window. I close out and tap the chart button. Now my position cursor displays and I notice that the AIS targets are popping up all around me. Best of all ...no wires!
Great AIS
This triggers new features in iNavX. With AIS showing, I go back to my navigational screen and hit instruments in the bottom TabBar. I notice that TCT is displayed. I click on it and up comes a complete list of all my
AIS targets. I can click on any one of those targets and get all the information about a particular vessel in a popover window. With another feature, click on the spyglass and iNavX takes you right to the target on the chart. Of all the nav programs out there, this has the best display of AIS. Back on the screen, I click once on an AIS target and get all his information. I see a predictor line from his bow (previously set for five minutes) to help determine CPA, closest point of approach.
Time for GRIB

So far so good in the trip. I am now navigating through narrow passages in the San Juans and iNavX has me plotted accurately. The day looks sunny and bright, but I want to know the weather window for today and tomorrow. My 3G signal on the iPad looks good, so I reach down and press forecast in the bottom TabBar. Up comes a menu page with "request GRIB". I select surface wind. The request goes out and about a minute later I have a GRIB file waiting for me. I download the file and return to the chart. Navionics charts are so easy to manipulate, I just use a pinch hand gesture, which reduces my scale down to about 1:10,000K revealing a GRIB file picture of wind arrows very closely spaced, along with Isobars showing me atmospheric highs and lows. Towards the top there is a blue bar that indicates the day and 12 hour Pacific Coast time. I just hit the double arrow button to the right and it takes me to the next 6 hour period. I hit it again, next and so on. I get an idea of what the weather is doing. Now, I am nearing the end of my trip.
I want to check the tides. I simply tap on the chart, nearing the entrance to Friday Harbor. My popover comes up and I select “tides”. At that point, iNavX goes directly to AyeTides and offers me a listing of tides and currents in my area. I get all the information that I need in a detailed account. I tap the AyeTides return button and I am right back to my position in iNavX.
When I arrive at Friday Harbor, I see an email with an iNavX update ready for download. What could be easier or more efficient.
Digi
To keep the iPad wireless and leave the computer at home, Rich came up with a nifty solution. A WiFi bridge called the Digi Wi-Sp was pulled into action. It's a little black box about 1 1/2" X 2 1/2". Plug in your serial cable and it'll transmit your data via an ad hoc network to your iPad.
One little problem, it's not the easiest item to set up. After giving it a try I had to enlist Rich's help. He offers the same help to any of his customers.
All data must plug into one serial outlet. If you want GPS and AIS, you have two solutions. Get one of the new class B AIS units (Tx/Rx) as they offer both AIS and GPS in their data stream, or if you have a Milltech AIS, you can use their "Y" cable. On another trip, this allowed me to hand hold the iPad back at the helm... Talk about freedom!
IPad or computer?
So the debate, will the iPad be able to take over for the computer. I feel that it will definitely be up to the job. I think that this program was very carefully written to be able to do just that. It is a basic application. It doesn’t have every single bell and whistle, however the author
has energetically improved this program as time has gone on, even to the point where a few have complained about too many updates. Of course for me, there could never be "too many". Those updates mean new improvements and features that he will be adding constantly.
iNavX can be daunting when starting out. The app seems basic, however the more you get into it the more you find. To help offset this, email help is almost instantaneous, there is a complete guide and forums are helpful. You also have the advantage of sitting at home and laying out all your courses, which is very conducive on the iPad.
So right now as a solid navigator I would have no trepidation about cruising anywhere. The accuracy and the main working functions are all there. It can only get better from this point. Now getting down to what is going to make this a super navigation device. That would be making it truly wireless, so you can walk anywhere on your vessel and have your navigation right in your hands.
Update
Just as I was finishing this article, Rich added beautiful analog instruments to display wind, depth and speed. It never ends.
.