Multiplans 4+

I would agree with the earlier reviews that this is a great app if you're prepared for a few tries at calibration and a steep learning curve.
I'm using it to get around Mauritius using a map I stitched together. It's certainly accurate enough for that and I'm able to save points of interest and to record tracks and show them as overlays.
Calibrate the map using data from google maps (right or control click on the map and choose 'what's here' to reveal long/ lat info- notice that the long and lat boxes are the opposite way around in multiplans!
Full marks though for a simple and useful app.

I fully agree with the previous review of this app - if you are fluent in latitude, longitude and the UTM coordinate system, then this is for you. I am not, but it looked to be ideal for what I needed, so I gave it a try. Getting a segmented map loaded was the easy bit, getting it correctly calibrated was a real pain as all the maps I produced showed me to be swimming in the middle of the Atlantic !!!
Anyway, after several failed attempts I emailed the developer - who has been a real star; Vincent could not have been more helpful in pointing out the error of my ways and teaching me how to calibrate my map correctly. It's funny how easy it is when you know what your doing ;-). What would make this a top app for everyone would be the ability to calibrate a loaded map (the easy bit) by clicking a button within the app to open into open Google maps, find 2-3 suitable coordination points that you have clicked on in the app and then to merge the data to produce a calibrated map - voilla!!. Maybe easier said than done, but calibration is the only issue (especially when you don't know what your doing), sort that issue and this will be a killer app to see off the expensive 'Memory Map' and 'Routbuddy' stuff that costs a fortune as OS map data is now freely available on the net.
Overall I'm delighted I stuck with it, a nice addition to my iPad.

This app has the rare asset that any map can be loaded into it - you are not obliged to accept Google Maps. I, for example, prefer the Swiss Topo maps and I can upload them. With this flexibility comes the need for precise creation of the map and data file for the app. This needs time, care and patience. For me the result is worth it but I expect many users will be so alarmed by the complex preparation as to abandon the app. An app for the serious practitioner not the amateur in a hurry.