Tracking a fishing bait boat without internet connection

hello everybody,
I’m new on this forum,but I have great expectations.
My big passion is carp fishing and for that I use a remote control bait boat,so it would be helpful to install an external device for tracking and memorized the routes of the boat using only RF transmission.
reallycooltoys.com/products-boats-RS-colorGPS.html
here is a link with a already made device with all the technical details.
My desire is to get something similar(or nearly),but CHEAPER! !
I read something about some modules from ROBOSHOP,RB-SPA-285 and RB-Dfr-18,need also a receiver module and a display but the problem is to put to work together all the necessary parts.I hope that once made ​​this device to be useful to other fishing enthusiasts with less financial possibilities.
Thank you for your endless kindness

Normally when you start from the component level, you are creating a prototype which will likely be on the expensive side. To put all of this together, you will need to be prepared to do a lot of programming - is this something you are comfortable with? If so, what programming languages? RB-Dfr-18 is a simple RF data transmitter and can’t really be used to track a position.

A GPS module feeds raw GPS values to a microcontroller, and then the microcontroller needs to interpret these values then either store them or plot them on a screen, but what else would that screen have? If you want it to communicate with Google Maps, you’ll need to design an interface, and Google Maps ideally needs a browser, which requires a computer as opposed to a cheap microcontroller.

The cheapest way to get and see GPS coordinates is likely an inexpensive smart phone with built-in GPS.

Just want you to get an idea of what you’re in for…