!!! NOTE !!!
From SEAiq version 4.0 (released December 2015) CM93 charts are no longer supported.
On Zen Again we have been using CM93 vector charts and KAP raster "charts" (produced from GoogleEarth imagery using GE2KAP) in OpenCPN as an aid to navigation. See our blog from 2012 on the latter. Ever since then we have been under the impression there was no software to present this information on our iPads. During our cruise through SE Asia we found no-one who knew of such software.
Today we discovered we were all wrong! Thanks Carolyn for pointing us in the right direction. There _is_ an app which can display CM93 and KAP charts on iPad. SEAiq is the answer and it is brilliant.
Within minutes of downloading and installing the app I had installed our CM93 charts. A few minutes later I had a few KAP files installed too. Once aboard Zen Again it took only a few minutes to configure SEAiq to accept AIS, GPS and instrument data from our Vesper XB-8000 AIS over WiFi.
The two screenshots below show example KAP and CM93 views, both of Direction Island in the Cocos-Keeling Islands. Changing between the two involves switching one setting (Raster Charts On/Off).
|KAP file GE image of Direction Island (Cocos-Keeling)|
|CM93 chart of Direction Island (Cocos-Keeling)|
|Success and Fishing Boat Harbours close up|
|Simplified CM93 View of Fremantle and Gage Roads|
|AIS Targets Page|
|Individual AIS Target Page|
|SailDocs GRIB Request Email|
The two issues I have found so far are:
- Some zip files containing kap files are not accepted by SEAiq, despite successfully loading the same set of files individually
- Unsurprisingly SEAiq gets a little slow if a large set of KAP files is loaded
It is surprising that SEAiq is not listed when one searches for "marine navigation" in the App Store. I think that explains why we've never heard of it before. I have mentioned this to the SEAiq folks.
Update (20 April): SEAiq will be listed under "marine navigation" from its next release in the App Store.
One thing's for sure - SEAiq is a very useful iPad app for sailors who need their charts supplemented by GoogleEarth imagery. It is a very nice chartplotter generally, but the support for both CM93 and KAP charts sets it apart. Very cool.