Originally Posted by Copinsay
I was wanting to check your thoughts on that and if it really was worth paying extra for the newer versions, such as the 5c 16GB or the 5s 16GB.
As a backup the iPhone is fine so long has you get a decent waterproof case thro which you can still use & clearly see the touchscreen - I have a Lifeproof one - available much cheaper on eBay than elsewhere - which seems pretty good.
I think 8gb is marginal memory and really if you are going to use the iPhone seriously especially with that sort of app ( & others) you need 32gb.
The big advantage of the 5, 5s & 5c over the 4 is the increased screen size especially for mapping/charting apps. All 4 & 5 iPhones can run the latest IOS (at present)
Again just be aware that the gps/location function only really works satisfactorily when you also have wifi coverage. Fine for coastal but iffy mid channel.